incite
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C1 verb /ɪnˈsaɪt/

incite

inciter
Meaning
to provoke; to stir up
Example
His speech incited the crowd to violence.
Son discours a incité la foule à la violence.
C1 verb /ɪmˈpɛrɪl/

imperil

mettre en danger
Meaning
To put in danger or at risk.
Example
Reckless driving can imperil the lives of others.
La conduite imprudente peut mettre la vie des autres en danger.
C1 adverb /ˌɪn.ədˈvɜːr.tənt.li/

Inadvertently

involontairement; par erreur
Meaning
without being aware of what you are doing; unintentionally; by mistake
Example
She inadvertently deleted the important file while cleaning her computer.
Elle a accidentellement supprimé le fichier important en nettoyant son ordinateur.
C1 adjective /ɪˈmeʒərəbəl/

Immeasurable

incommensurable
Meaning
too large or extensive to measure; boundless
Example
The immeasurable love of a mother knows no bounds.
L'amour incommensurable d'une mère ne connaît aucune limite.
C1 noun /ˌɪrɪˌspɒnsəˈbɪləti/

irresponsibility

irresponsabilité
Meaning
lack of responsibility or accountability; failure to act in a reliable or sensible way
Example
The accident was caused by his irresponsibility at work.
L'accident a été causé par son irresponsabilité au travail.
C1 adjective /ɪnˈdʌstriəs/

industrious

travailleur
Meaning
Hardworking and diligent in one's duties.
Example
She is an industrious student who always completes her assignments on time.
Elle est une étudiante travailleuse qui termine toujours ses devoirs à temps.
C1 adjective /ɪnˈkɒŋɡruəs/

incongruous

incongru
Meaning
Not fitting in with or suitable for the surroundings.
Example
His jokes were incongruous during the serious meeting.
Ses blagues étaient incongrues lors de la réunion sérieuse.
C1 adjective /ɪmˈpɜːrviəs/

impervious

imperméable
Meaning
Not allowing fluid to pass through; unable to be affected by something.
Example
The jacket is impervious to rain.
La veste est imperméable à la pluie.
C1 noun /ˌɪnfɪˈdɛləti/

infidelity

infidélité
Meaning
the act of being unfaithful to a spouse or partner
Example
Their marriage ended due to his infidelity.
Leur mariage a pris fin à cause de son infidélité.
C1 noun /aɪˈdiː.ə.lɪ.zəm/

Idealism

Idéalisme
Meaning
the pursuit of high principles and noble goals; unrealistic pursuit of perfection
Example
His youthful idealism motivated him to join various social justice movements.
Son idéalisme juvénile l'a motivé à rejoindre divers mouvements de justice sociale.
C1 adjective ˌɪn.krəˈmen.təl

incremental

incrémental
Meaning
Relating to or denoting an increase or addition, especially one of a series on a fixed scale; proceeding in small stages.
Example
Incremental changes ensure sustainability.
Les changements incrémentaux assurent la durabilité.
C1 noun /ˈɪn.trə.vɜːrt/

introvert

introverti
Meaning
A person who tends to be shy and prefers spending time alone rather than in groups.
Example
As an introvert, he preferred reading over attending parties.
En tant qu'introverti, il préférait lire plutôt qu'assister à des fêtes.
C1 verb /ɪmˈploʊd/

implode

imploser
Meaning
To collapse or burst inward violently.
Example
The old building imploded during the demolition.
Le vieux bâtiment a implosé pendant la démolition.
C1 noun /ˌɪnflɛksɪˈbɪlɪti/

inflexibility

inflexibilité
Meaning
the quality of being rigid or unwilling to change; lack of adaptability
Example
The inflexibility of the rules caused unnecessary delays.
L’inflexibilité des règles a causé des retards inutiles.
C1 adverb /ɪnˈdɛfɪnətli/

indefinitely

indéfiniment
Meaning
for an unlimited or unspecified period of time
Example
The project has been postponed indefinitely.
Le projet a été reporté indéfiniment.
C1 noun /ˈɪntərˌluːd/

interlude

interlude
Meaning
A short period of time that comes between two events; an interval.
Example
There was a brief musical interlude between the two acts of the play.
Il y a eu un bref interlude musical entre les deux actes de la pièce.
C1 adjective /ɪˈnuːmərəbəl/

Innumerable

innombrable; incalculable; infini
Meaning
too many to be counted; countless; infinite in number
Example
There are innumerable stars in the night sky that we cannot see with our naked eyes.
Il y a d'innombrables étoiles dans le ciel nocturne que nous ne pouvons pas voir à l'œil nu.
C1 adjective /ɪˈrɛpərəbəl/

Irreparable

irréparable
Meaning
impossible to repair or fix; permanent damage that cannot be undone
Example
The accident caused irreparable damage to his spine.
L'accident a causé des dommages irréparables à sa colonne vertébrale.
C1 adjective /ɪnˈtɛlɪdʒəbl/

intelligible

intelligible
Meaning
Able to be understood; clear enough to be comprehended.
Example
Her speech was barely intelligible over the noise.
Son discours était à peine intelligible à cause du bruit.
C1 adjective /ˌɪnkənˈsɪdərət/

inconsiderate

inconsidéré
Meaning
Thoughtless; showing a lack of concern for others.
Example
It was inconsiderate of him to play loud music late at night.
C'était inconsidéré de sa part de jouer de la musique forte tard dans la nuit.
C1 adjective /ɪmˈpɜːmiəbl/

impermeable

imperméable
Meaning
Not allowing fluid or gas to pass through.
Example
The container is made of impermeable plastic.
Le conteneur est fabriqué en plastique imperméable.
C1 adjective /ɪnˈfæləbl̩/

infallible

infaillible
Meaning
incapable of making mistakes or being wrong
Example
Her judgment seemed infallible in matters of finance.
Son jugement semblait infaillible en matière de finances.
C1 adjective /ɪˈræʃənəl/

irrational

irrationnel
Meaning
not logical or reasonable; lacking clear thought
Example
His fear of the dark was completely irrational.
Sa peur de l'obscurité était complètement irrationnelle.
C1 noun (plural) /ˈɪndɪˌsiːz/

indices

indices
Meaning
plural form of index; statistical measures or reference points used for comparison
Example
Stock market indices fell sharply after the announcement.
Les indices du marché boursier ont chuté fortement après l'annonce.
C1 noun /ɪnˈsæn.ə.ti/

Insanity

folie; démence
Meaning
the state of being seriously mentally ill; extreme foolishness or irrationality
Example
The defense lawyer argued that his client was not guilty by reason of insanity.
L'avocat de la défense a soutenu que son client n'était pas coupable pour cause de folie.
C1 verb /ɪmˈplɔːr/

implore

implorer
Meaning
To beg someone earnestly or desperately to do something.
Example
She implored him to stay with her.
Elle lui implora de rester avec elle.
C1 noun /ˈɪd.i.əm/

idiom

idiome
Meaning
A group of words whose meaning is different from the meanings of the individual words.
Example
The idiom 'break the ice' means to start a conversation in a friendly way.
L'idiome 'briser la glace' signifie commencer une conversation de manière amicale.
C1 adjective /ˌɪnkəʊˈhɪərənt/

incoherent

incohérent
Meaning
Not clear or easy to understand; lacking logical connection.
Example
His explanation was so incoherent that nobody could follow it.
Son explication était tellement incohérente que personne ne pouvait la suivre.
C1 noun /ɪnˈsɜːrdʒənt/

insurgent

insurgé
Meaning
A person who rises in revolt against authority or government.
Example
The army arrested several insurgents after the attack.
L'armée a arrêté plusieurs insurgés après l'attaque.
C1 adjective /ɪnˈhjuːmən/

Inhuman

inhumain
Meaning
lacking human qualities; cruel; brutal; savage
Example
The dictator's inhuman treatment of prisoners shocked the international community.
The dictator's inhuman treatment of prisoners shocked the international community.
C1 noun /ɪmˈpɛd.ɪ.mənt/

impediment

obstacle
Meaning
A hindrance or obstruction in doing something; something that prevents progress.
Example
Lack of funds is a major impediment to the project.
Le manque de fonds est un obstacle majeur pour le projet.
C1 verb /ɪnˈhɪbɪt/

inhibit

inhiber
Meaning
to prevent or restrain someone or something from acting freely; to hinder
Example
Fear can inhibit personal growth.
La peur peut inhiber la croissance personnelle.
C1 noun /ɪnˌtɪmɪˈdeɪʃən/

intimidation

intimidation
Meaning
The action of frightening or threatening someone to make them do something.
Example
The workers reported cases of intimidation by the management.
Les travailleurs ont signalé des cas d'intimidation par la direction.
C1 adjective /ɪˈnɜːrt/

inert

inactif
Meaning
lacking the ability or strength to move or act; chemically inactive
Example
The patient remained inert on the bed.
Le patient est resté inactif sur le lit.
C1 verb /ɪnˈtruːd/

intrude

interrompre
Meaning
To enter a place or situation where one is not wanted or not invited.
Example
He felt embarrassed to intrude on their private conversation.
Il s'est senti embarrassé d'interrompre leur conversation privée.
C1 adjective /ɪmˈprɒbəbl/

improbable

improbable
Meaning
Not likely to be true or to happen.
Example
It seems improbable that he will arrive on time.
Il semble improbable qu'il arrive à l'heure.
C1 noun ɪmˈpɛə(r)mənt

impairment

dommages, handicap
Meaning
The state of being damaged or weakened; a disability or handicap.
Example
Hearing impairment can be caused by long-term exposure to loud noise.
La perte auditive peut être causée par une exposition prolongée à des bruits forts.
C1 adjective /ˌɪmprɪˈsaɪs/

imprecise

imprécis
Meaning
Not exact or accurate; vague.
Example
His explanation was too imprecise to be helpful.
Son explication était trop imprécise pour être utile.
C1 adjective /ɪnˈsɛnsəbl/

insensible

insensible
Meaning
Unconscious; unaware of or indifferent to something.
Example
He was insensible to the cold as he lay in the snow.
Il était insensible au froid lorsqu'il était allongé dans la neige.
C1 noun /ˌɪntərˈdʒɛkʃən/

interjection

interjection
Meaning
a word or phrase used to express sudden emotion or reaction, often standing alone
Example
Words like 'wow' and 'ouch' are common interjections in English.
Des mots comme 'wow' et 'aïe' sont des interjections courantes en anglais.
C1 noun /ˈɪnˌmeɪt/

inmate

détenu
Meaning
a person confined to an institution such as a prison or hospital
Example
The prison has over a thousand inmates.
La prison a plus de mille détenus.
C1 noun /ɪmˈprɪzənmənt/

imprisonment

emprisonnement
Meaning
the act of putting someone in prison; the state of being confined as punishment
Example
He faced imprisonment for violating the court order.
Il a fait face à l'emprisonnement pour avoir violé l'ordre du tribunal.
C1 verb /ɪnˈfjuːz/

infuse

infuser
Meaning
to fill or spread through something; to instill a quality, idea, or feeling
Example
The teacher tried to infuse her students with a love for reading.
Le professeur a essayé d'infuser à ses élèves un amour pour la lecture.
C1 adjective /ˌɪn.səbˈstæn.ʃəl/

insubstantial

insubstantiel
Meaning
Lacking strength, substance, or solidity.
Example
The evidence provided was insubstantial and unconvincing.
Les preuves fournies étaient insubstantielles et non convaincantes.
C1 noun /ɪnˈsek.tɪ.saɪd/

Insecticide

insecticide
Meaning
a substance used for killing insects; a chemical pesticide that targets insects
Example
The farmer sprayed insecticide on his crops to protect them from harmful bugs.
Le fermier a pulvérisé de l'insecticide sur ses cultures pour les protéger des insectes nuisibles.
C1 noun ˈɪn.fər.əns

inference

inférence
Meaning
A conclusion reached on the basis of evidence and reasoning; logical deduction.
Example
Scientists make inferences based on experimental data.
Les scientifiques font des inférences basées sur des données expérimentales.
C1 adjective /ɪˈrɛfjʊtəbəl/

Irrefutable

irréfutable
Meaning
impossible to deny or disprove; undeniable
Example
The evidence against him was irrefutable.
Les preuves contre lui étaient irréfutables.
C1 noun ˌɪndɪˈspensəbl̩ ˈkɒmpɪtənsi

indispensable competency

compétence indispensable
Meaning
Essential skill or ability that cannot be done without; a crucial capability that is absolutely necessary.
Example
Digital literacy is an indispensable competency in the 21st century.
L'alphabétisation numérique est une compétence indispensable au XXIe siècle.
C1 noun ˌɪn.fɪlˈtreɪ.ʃən

infiltration

infiltration, accès secret
Meaning
The process of entering or gaining access to an organization or place surreptitiously.
Example
Cybersecurity prevents infiltration into sensitive data.
La cybersécurité empêche l'infiltration des données sensibles.
C1 adjective /ˌɪnɪkˈsplɪkəbl/

inexplicable

inexpliquable
Meaning
Impossible to explain or understand.
Example
The sudden disappearance of the file was inexplicable.
La disparition soudaine du fichier était inexpliquable.
C1 adjective /ɪmˈprɒmp.tjuː/

impromptu

imprévu
Meaning
Done without being planned, organized, or rehearsed; spontaneous.
Example
He gave an impromptu speech at the event.
Il a fait un discours improvisé lors de l'événement.
C1 noun /ɪnˈdɪɡ.nə.ti/

Indignity

indignité; humiliation; déshonneur;
Meaning
treatment or circumstances that cause one to feel shame or loss of dignity; humiliation
Example
She refused to suffer the indignity of being searched without proper cause.
Elle a refusé de subir l'indignité d'être fouillée sans raison valable.
C1 adjective /ˈɪnsjələr/

insular

étroit d'esprit, relatif à une île
Meaning
Narrow-minded, isolated, or relating to an island.
Example
The community was criticized for its insular attitudes toward outsiders.
La communauté a été critiquée pour ses attitudes insulaires envers les étrangers.
C1 adjective /ɪmˈplɔːzəbl/

implausible

implausible
Meaning
Not seeming reasonable or probable; unlikely to be true.
Example
The story she told was so implausible that no one believed her.
L'histoire qu'elle a racontée était tellement implausible que personne ne l'a cru.
C1 adjective /ɪˈnænɪmət/

inanimate

objet inanimé
Meaning
not alive, especially not in the manner of animals and humans; lifeless
Example
The museum was full of inanimate objects from ancient times.
Le musée était rempli d'objets inanimés datant de l'époque ancienne.
C1 adjective /ɪnˈsɛp(ə)rəbəl/

inseparable

inséparable
Meaning
Unable to be separated or always together.
Example
The two friends have been inseparable since childhood.
Les deux amis sont inséparables depuis l'enfance.
C1 noun /ˈɪnkjʊˌbeɪtər/

incubator

incubateur
Meaning
a device or environment that provides suitable conditions for eggs, cells, or infants to develop
Example
The premature baby was placed in an incubator for care.
Le bébé prématuré a été placé dans un incubateur pour ses soins.
C1 adjective /ɪnˈveɪsɪv/

invasive

invasif
Meaning
Tending to spread harmfully, intruding aggressively, or encroaching beyond proper boundaries.
Example
The doctor explained that the procedure was minimally invasive.
Le médecin a expliqué que la procédure était peu invasive.
C1 noun /ɪnˈsɒm.ni.ə/

Insomnia

insomnie
Meaning
habitual sleeplessness; inability to sleep; the condition of being unable to sleep
Example
Her chronic insomnia made it difficult for her to concentrate during work hours.
Son insomnie chronique lui rendait difficile de se concentrer pendant les heures de travail.
C1 adjective /ɪnˈtɜːrmənəbl/

interminable

interminable
Meaning
Seemingly endless; having no apparent end.
Example
The meeting felt interminable and exhausting.
La réunion semblait interminable et épuisante.
C1 adjective /ˌɪn.ɪˈfɛk.tʃu.əl/

ineffectual

inefficace
Meaning
Not producing any or the desired effect; lacking the ability or qualities to achieve a purpose.
Example
The manager’s ineffectual leadership caused the team to lose motivation.
Le leadership inefficace du manager a causé la perte de motivation de l'équipe.
C1 noun /ˈaɪsətəʊp/

isotope

isotope
Meaning
Atoms of the same element with equal number of protons but different numbers of neutrons.
Example
Carbon-14 is a radioactive isotope used in dating fossils.
Le carbone-14 est un isotope radioactif utilisé pour dater les fossiles.
C1 adjective /ɪnˈflæməˌtɔːri/

inflammatory

bonheur
Meaning
causing inflammation in the body; arousing anger, hostility, or strong emotion
Example
His inflammatory speech triggered protests across the city.
Elle ne pouvait pas cacher son bonheur lorsqu'elle a reçu le prix.
C1 noun ˌɪn.toʊˈneɪ.ʃən

intonation

intonation
Meaning
The rise and fall of tone in speech and pronunciation.
Example
Proper intonation enhances the clarity of a speech.
Une intonation appropriée améliore la clarté d'un discours.
C1 adjective /ˌɪndɪˈsaɪsɪv/

Indecisive

indécis
Meaning
unable to make decisions quickly; hesitant; wavering
Example
She was indecisive about which university to attend.
Elle était indécise quant à l'université qu'elle allait fréquenter.
C1 verb /ˌɪn.trəˈspekt/

introspect

introspecter
Meaning
To examine one's own thoughts, feelings, or mental state.
Example
He often introspects before making important decisions.
Il se livre souvent à de l'introspection avant de prendre des décisions importantes.
C1 adjective /ɪmˈpæsəbəl/

impassable

impraticable
Meaning
Impossible to travel along or over.
Example
The road became impassable after the heavy snowfall.
La route est devenue impraticable après la forte neige.
C1 adjective /ɪnˈvɛntɪv/

inventive

inventif
Meaning
Having the ability to create or design new things or to think originally.
Example
The inventor was known for his inventive solutions to everyday problems.
L'inventeur était connu pour ses solutions inventives aux problèmes quotidiens.
C1 noun ˈɪm.pɪ.təs

impetus

impulsion
Meaning
The force or motivation that drives something forward; momentum.
Example
The new policy provided an impetus for economic growth.
La nouvelle politique a donné un élan à la croissance économique.
C1 verb /aɪˈdiː.ə.laɪz/

idealize

idéaliser
Meaning
To regard or represent something as perfect or better than it really is.
Example
Children often idealize their parents.
Les enfants idéalisent souvent leurs parents.
C1 noun /ˌaɪ.diˈɒl.ə.dʒi/

ideology

idéologie
Meaning
A system of ideas and ideals, especially one that forms the basis of economic or political theory and policy.
Example
Democracy is based on the ideology of freedom and equality.
La démocratie repose sur l'idéologie de la liberté et de l'égalité.
C1 verb /ˌɪn.tɚˈtwaɪn/

intertwine

connecter ou lier étroitement; tordre ou combiner étroitement
Meaning
To connect or link closely; to twist together or combine closely.
Example
Their lives became intertwined through years of friendship.
Leurs vies se sont entrelacées au fil des années d'amitié.
C1 noun /ˌɪntərˈmɪʃən/

intermission

entracte
Meaning
A pause or break, especially during a performance or event.
Example
The play had a twenty-minute intermission.
La pièce a eu un entracte de vingt minutes.
C1 verb /ɪˈnɔːɡjʊreɪt/

inaugurate

inaugurer
Meaning
To formally begin or introduce something, especially with a ceremony.
Example
The mayor will inaugurate the new bridge tomorrow.
Le maire inaugurera le nouveau pont demain.
C1 adjective ɪnɪɡˈzɔːstɪbəl

inexhaustible

inépuisable
Meaning
Unable to be used up or worn out; limitless.
Example
His inexhaustible energy allowed him to work tirelessly on his projects.
Son énergie inépuisable lui a permis de travailler sans relâche sur ses projets.
C1 noun /ˌɪn.trəˈspek.ʃən/

introspection

introspection
Meaning
The examination or observation of one's own mental and emotional processes; self-reflection.
Example
Through introspection, she gained insight into her emotions.
Grâce à l'introspection, elle a acquis une profonde compréhension de ses émotions.
C1 noun /ˌɪmpɔːrˈteɪʃən/

importation

importation
Meaning
The act of bringing goods or services into a country from abroad
Example
The importation of luxury goods is strictly regulated.
L'importation de produits de luxe est strictement régulée.
C1 adjective /ɪnˈæk.tɪv/

Inactive

inactif
Meaning
not active; not working; dormant; idle
Example
The volcano has been inactive for over a century.
Le volcan est inactif depuis plus d'un siecle.
C1 noun ɪnˈdɪdʒɪnəs trəˈdɪʃənz

Indigenous Traditions

Traditions indigènes
Meaning
Cultural practices, beliefs, and customs that have been passed down through generations among native peoples.
Example
Indigenous traditions in the Chittagong Hill Tracts are unique.
Les traditions indigènes dans les Chittagong Hill Tracts sont uniques.
C1 verb /ɪnˈsɪnjueɪt/

insinuate

insinuer
Meaning
To suggest or hint something indirectly and often unpleasantly.
Example
He insinuated that she had lied about her qualifications.
Il a insinué qu'elle avait menti sur ses qualifications.
C1 adverb ɪnˈtrɪn.zɪ.kli

intrinsically

intrinsèquement
Meaning
In a way that is naturally or inherently part of something's essential nature.
Example
Some people are intrinsically motivated to learn.
Certaines personnes sont intrinsèquement motivées à apprendre.
C1 adjective /ˌɪnɔːrˈɡænɪk/

inorganic

inorganique
Meaning
relating to substances that are not derived from living organisms; lacking organic structure or growth
Example
Inorganic compounds are commonly studied in chemistry labs.
Les composés inorganiques sont courants en chimie.
C1 adjective /ɪnˈvɑːlənˌtɛri/

involuntary

involontaire
Meaning
done without will or conscious control
Example
He gave an involuntary shiver when he heard the loud noise.
Il a eu un frisson involontaire lorsqu'il a entendu le bruit fort.
C1 noun ɪnˈflɛk.ʃən

inflection

inflexion
Meaning
The change in pitch or tone of voice when speaking for emphasis.
Example
His inflection kept the audience engaged.
Son inflexion a captivé le public.
C1 verb /ˈɪtəreɪt/

iterate

itérer
Meaning
To repeat a process or statement, often to improve or refine.
Example
The software team will iterate the design until it meets user needs.
L'équipe de développement itérera la conception jusqu'à ce qu'elle réponde aux besoins des utilisateurs.
C1 verb /ˈɪnsjuleɪt/

insulate

isoler
Meaning
To protect something by covering it, especially to prevent heat, sound, or electricity from escaping or entering.
Example
The house was insulated to reduce heating costs.
La maison a été isolée pour réduire les coûts de chauffage.
C1 adjective /ˌɪnkənˈkluːsɪv/

inconclusive

inconclusif
Meaning
Not leading to a definite result or decision.
Example
The investigation remained inconclusive due to a lack of evidence.
L'enquête est restée inconclusive en raison d'un manque de preuves.
C1 adjective /ɪˈmækjələt/

immaculate

immaculé
Meaning
perfectly clean, neat, or free from flaws
Example
Her room was immaculate, with everything in its place.
Sa chambre était immaculée, tout était à sa place.
C1 adjective /ˌɪn.dɪˈspen.sə.bəl/

indispensable

indispensable
Meaning
Absolutely necessary, essential
Example
Water is indispensable for human survival.
L'eau est indispensable à la survie humaine.
C1 noun /ˌɪmɔːrˈtæləti/

immortality

immortalité
Meaning
the state of living forever; eternal life or lasting fame beyond death
Example
Many ancient cultures believed that heroes could achieve immortality through great deeds.
De nombreuses cultures anciennes pensaient que les héros pouvaient atteindre l’immortalité par de grands exploits.
C1 adjective ɪnˈkʌm.bənt

incumbent

obligatoire
Meaning
necessary for (someone) as a duty or responsibility.
Example
It is incumbent upon all citizens to obey the law.
Il est obligatoire pour tous les citoyens d'obéir à la loi.
C1 adjective /ɪmˈpɛn.ɪ.trə.bəl/

impenetrable

impénétrable
Meaning
Impossible to pass through or enter; impossible to understand.
Example
The dense forest was nearly impenetrable.
La forêt dense était presque impénétrable.
C1 noun /ˌɪməˈtjʊərəti/

immaturity

immaturité
Meaning
the state of not being fully developed emotionally, mentally, or physically; lack of maturity
Example
His immaturity made it difficult for him to handle responsibility.
Son immaturité a rendu la gestion des responsabilités difficile.
C1 adjective /ɪnˈdʌldʒənt/

indulgent

indulgent
Meaning
Having a tendency to be overly generous or lenient with someone.
Example
The indulgent mother allowed her child to stay up late.
La mère indulgente a permis à son enfant de rester éveillé tard.
C1 verb /ɪɡˈnaɪt/

ignite

enflammer
Meaning
To catch fire or cause to catch fire; to start or arouse.
Example
The sparks ignited the dry leaves in seconds.
Les étincelles ont enflammé les feuilles sèches en quelques secondes.
C1 verb /ˈɪnfɪltreɪt/

infiltrate

infiltrer
Meaning
to secretly enter or gain access to a place or group
Example
The spies managed to infiltrate the enemy base.
Les espions ont réussi à infiltrer la base ennemie.
C1 adjective /ɪnˈtændʒəbl/

intangible

intangible
Meaning
Unable to be touched or grasped; not having a physical presence.
Example
Trust is an intangible quality in relationships.
La confiance est une qualité intangible dans les relations.
C1 adjective /ˌɪndɪˈfɛnsəbl̩/

indefensible

indéfendable
Meaning
not able to be protected or justified
Example
The minister’s remarks were considered indefensible by the public.
Les remarques du ministre ont été jugées indéfendables par le public.
C1 noun /ˈɪnlɛt/

inlet

entrée
Meaning
A small arm of the sea, a lake, or a river; an opening or passage for entry.
Example
The boat entered a narrow inlet along the coast.
Le bateau est entré dans une entrée étroite le long de la côte.
C1 noun ɪˌræʃ.ənˈæl.ɪ.ti

irrationality

irrationalité, absence de logique, déraison
Meaning
The quality of being illogical or unreasonable; lack of rational thought.
Example
His decision was driven by complete irrationality.
Sa décision a été guidée par une irrationalité totale.
C1 adjective /ɪnˈstɪŋk.tɪv/

instinctive

instinctif, naturel, automatique
Meaning
Based on instinct; done without conscious thought; natural and automatic.
Example
His instinctive reaction saved his life.
Sa réaction instinctive lui a sauvé la vie.
C1 adjective /ɪˈmoʊbəl/

immobile

immobile
Meaning
unable to move or be moved
Example
After the accident, he was immobile for weeks.
Après l'accident, il est resté immobile pendant des semaines.
C1 noun ɪnˌɛv.ɪ.təˈbɪl.ɪ.ti

inevitability

inévitabilité
Meaning
The quality of being certain to happen and impossible to avoid or prevent.
Example
The inevitability of change is a part of life.
L'inévitabilité du changement fait partie de la vie.
C1 verb ɪˈnɔː.ɡjə.reɪ.tɪd

inaugurated

inauguré
Meaning
Begin or introduce (a system, policy, or period) formally.
Example
The organization was inaugurated officially.
L'organisation a été inaugurée officiellement.
C1 noun /ɪnˈdjuːsmənt/

inducement

incitation
Meaning
something that persuades or encourages someone to do something
Example
The company offered a bonus as an inducement to employees.
L'entreprise a offert une prime comme incitation aux employés.
C1 noun /ɪnˈdem.nə.ti/

Indemnity

indemnité
Meaning
security or protection against a loss or other financial burden; compensation for damage or loss
Example
The insurance company provided full indemnity for the damages caused by the flood.
La compagnie d'assurance a fourni une indemnité complète pour les dommages causés par l'inondation.
C1 adjective /ɪnˈtræk.tə.bəl/

intractable

incontrôlable
Meaning
Difficult or impossible to manage, control, or solve.
Example
The conflict has become an intractable problem.
Le conflit est devenu un problème incontrôlable.
C1 verb /ɪnˈkrɪmɪˌneɪt/

incriminate

incriminer
Meaning
to make someone appear guilty of a crime or wrongdoing
Example
The new evidence could incriminate the suspect in the robbery case.
La nouvelle preuve pourrait incriminer le suspect dans l'affaire de vol.
C1 verb /ɪnˈvɪɡ.ər.eɪt/

invigorate

revigorer
Meaning
To give strength or energy to someone or something.
Example
A morning walk can invigorate both body and mind.
Une promenade matinale peut revigorer le corps et l'esprit.
C1 noun ˌɪnfrəˈstrʌktʃərəl dɪˈveləpmənt

infrastructural development

développement infrastructurel
Meaning
The process of building and improving the basic physical and organizational structures and facilities needed for the operation of a society or enterprise.
Example
Infrastructural development is necessary for efficient recycling.
Le développement infrastructurel est nécessaire pour un recyclage efficace.
C1 adjective /ˈɪnsələnt/

insolent

insolent, arrogant
Meaning
showing a rude and arrogant lack of respect
Example
The insolent student refused to follow the teacher's instructions.
L'étudiant insolent a refusé de suivre les instructions du professeur.
C1 adjective /ˈɪmpətənt/

impotent

impotent
Meaning
Lacking power, ability, or strength to take effective action.
Example
The citizens felt impotent against the corrupt system.
Les citoyens se sont sentis impuissants face au système corrompu.
C1 noun /ɪnˈɛk.wɪ.ti/

inequity

inégalité
Meaning
Lack of fairness or justice; unequal distribution or treatment.
Example
Social inequity continues to be a global issue.
L'inégalité sociale reste un problème mondial.
C1 adjective ɪnˈsaɪ.sɪv

incisive

incisif
Meaning
Intelligently analytical and clear-thinking; showing clear thought and good understanding of what is important.
Example
His incisive comments revealed the core issues.
Ses commentaires incisifs ont révélé les problèmes clés.
C1 adjective /ɪmˈpæʃənd/

impassioned

passionné
Meaning
Filled with or showing great emotion.
Example
She gave an impassioned speech about human rights.
Elle a prononcé un discours passionné sur les droits de l'homme.
C1 noun /ɪmˈpɛdɪmənt/

impediments

obstacles
Meaning
A hindrance or obstruction in doing something; things that prevent progress or achievement.
Example
Economic impediments often hinder social development.
Les obstacles économiques entravent souvent le développement social.
C1 noun /ɪmˌpɜː.sənˈeɪ.ʃən/

impersonation

usurpation d'identité
Meaning
The action of pretending to be another person for the purpose of entertainment or fraud.
Example
Online impersonation is a serious cybercrime.
L'usurpation d'identité en ligne est un crime informatique grave.
C1 noun /ɪnˈfɜːməri/

infirmary

infirmerie
Meaning
A hospital or place where the sick or injured are cared for.
Example
The school had an infirmary for minor injuries.
L'école avait une infirmerie pour les blessures mineures.
C1 adjective /ɪnˈtrɛpɪd/

intrepid

intrépide
Meaning
fearless and adventurous, often used humorously
Example
The intrepid traveler explored the jungle alone.
Le voyageur intrépide a exploré la jungle seul.
C1 adjective /ˈaɪərnˌklæd/

ironclad

inflexible
Meaning
impossible to change, break, or dispute; very strong and firm
Example
The company had an ironclad contract with its suppliers.
L'entreprise avait un contrat inflexible avec ses fournisseurs.
C1 noun ɪnˈsɛpʃən

inception

inception
Meaning
The establishment or starting point of an institution or activity.
Example
The inception of the company marked a new era in the industry.
L'inception de l'entreprise a marqué une nouvelle ère dans l'industrie.