inferno
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C1 noun /ɪnˈfɜːrnoʊ/

inferno

incendie
Meaning
a large, intense fire that is dangerously out of control
Example
The building turned into an inferno within minutes.
Le bâtiment s'est transformé en un incendie en quelques minutes.
C1 adjective /ɪmˈpɛtʃ.u.əs/

impetuous

impulsif
Meaning
Acting or done quickly and without thought or care; impulsive.
Example
His impetuous decision led to unexpected consequences.
Sa décision impulsive a conduit à des conséquences inattendues.
C1 adjective /ɪnˈdɪɡnənt/

indignant

indigné
Meaning
Feeling or showing anger at something considered unfair or unjust.
Example
She was indignant when accused of cheating.
Elle était indignée lorsqu'elle a été accusée de tricher.
C1 adjective /ˌaɪ.di.əˈlɒdʒ.ɪ.kəl/

ideological

idéologique
Meaning
Relating to or based on a system of ideas or beliefs.
Example
The two parties are divided by deep ideological differences.
Les deux partis sont divisés par de profondes divergences idéologiques.
C1 adjective /ɪnˈvɜːs/

Inverse

inverse; opposé
Meaning
opposite in order, nature, or effect; reversed
Example
There is an inverse relationship between price and demand.
Il existe une relation inverse entre le prix et la demande.
C1 noun /ɪˈnɜː.ʃə/

Inertia

inertie; manque d'activité
Meaning
a tendency to do nothing or remain unchanged; lack of activity or movement
Example
The team's inertia prevented them from adapting to the rapidly changing market conditions.
L'inertie de l'équipe les a empêchés de s'adapter aux conditions du marché en évolution rapide.
C1 noun /ˈɪnstɪˌɡeɪtər/

instigator

instigateur
Meaning
A person who brings about or initiates something, usually something bad.
Example
The police identified him as the instigator of the violence.
La police l'a identifié comme l'instigateur de la violence.
C1 adjective /ˌɪnkəmˈpætəbl/

incompatible

incompatible
Meaning
Not able to exist or work together without conflict.
Example
Their personalities were completely incompatible.
Leurs personnalités étaient complètement incompatibles.
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 /ˌɪnkɒmprɪˈhɛnsəbl/

incomprehensible

incompréhensible
Meaning
Impossible or very difficult to understand.
Example
The professor’s lecture was so fast it became incomprehensible.
Le cours du professeur était tellement rapide qu'il est devenu incompréhensible.
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 adjective /ɪˈnɒkjuəs/

innocuous

inoffensif
Meaning
Not harmful or offensive.
Example
His remark was completely innocuous and not meant to offend anyone.
Son commentaire était totalement inoffensif et n'avait pas l'intention d'offenser qui que ce soit.
C1 adjective /ɪnˈfɜːm/

infirm

fragile
Meaning
Weak, especially due to old age or illness.
Example
The infirm old man needed assistance to walk.
L'homme âgé et fragile avait besoin d'aide pour marcher.
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 adjective /ˌɪnəˈfɛnsɪv/

inoffensive

inoffensif
Meaning
Not likely to offend or provoke; harmless.
Example
His inoffensive remarks kept the conversation friendly.
Ses remarques inoffensives ont maintenu la conversation amicale.
C1 adjective /ˌɪnɑːrˈtɪkjʊlət/

inarticulate

inaudible
Meaning
Unable to express oneself clearly or effectively in speech or writing.
Example
She became inarticulate with emotion during the speech.
Elle est devenue inaudible avec émotion pendant le discours.
C1 adjective /ˈɪnərmoʊst/

Innermost

le plus profond; le plus personnel
Meaning
most private and secret; deepest; most personal
Example
She shared her innermost feelings with her closest friend.
Elle a partagé ses sentiments les plus profonds avec son ami le plus proche.
C1 adjective /ɪmˈpʌlsɪv/

impulsive

impulsif, spontané
Meaning
acting suddenly without careful thought
Example
She made an impulsive decision to buy the car.
Elle a pris une décision impulsive d'acheter la voiture.
C1 noun /ˈɪnsɪdəns/

incidence

incidence
Meaning
the occurrence, rate, or frequency of something
Example
The incidence of road accidents has decreased this year.
L'incidence des accidents de la route a diminué cette année.
C1 noun /ˈɪŋklɪŋ/

inkling

indice
Meaning
A slight idea, hint, or suspicion about something.
Example
She had an inkling that he was planning a surprise.
Elle avait une vague idée qu'il préparait une surprise.
C1 noun /ɪnˈækjʊrəsi/

inaccuracy

inexactitude
Meaning
lack of accuracy or precision; an incorrect or wrong detail
Example
The report contained several factual inaccuracies.
Le rapport contenait plusieurs inexactitudes.
C1 noun /ɪnˈhɛrɪtər/

inheritor

héritier
Meaning
a person who receives money, property, or a title when someone dies
Example
She became the inheritor of her family's estate.
Elle est devenue l'héritière de la propriété de sa famille.
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 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 adjective /ɪˈnɔːɡjərəl/

Inaugural

inaugural
Meaning
marking the beginning of something; first; opening
Example
The president delivered his inaugural speech.
Le président a prononcé son discours inaugural.
C1 adjective /ɪnˈfleɪtɪd/

inflated

gonflé
Meaning
excessively increased in size, value, or importance; filled with air or gas
Example
The company faced criticism for its inflated prices.
L'entreprise a fait face à des critiques en raison de ses prix gonflés.
C1 noun /ˌɪməˈrælɪti/

immorality

immoralité
Meaning
the quality of being immoral; behavior that violates accepted moral standards
Example
The community condemned the immorality of the corrupt officials.
La communauté a condamné l’immoralité des fonctionnaires corrompus.
C1 adjective /ɪnˈdetɪd/

Indebted

endetté; reconnaissant
Meaning
owing money or gratitude to someone; obligated; grateful
Example
I am deeply indebted to my teacher for all her guidance.
Je suis profondément endetté envers ma professeure pour toute sa guidance.
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 /ˌɪnədˈmɪsəbl̩/

inadmissible

inadmissible
Meaning
Not allowed, especially as evidence in a court of law.
Example
The judge ruled the evidence inadmissible.
Le juge a déclaré que la preuve était inadmissible.
C1 adjective /ɪˈlɪsɪt/

illicit

illicite
Meaning
Forbidden by law, rules, or custom.
Example
The police shut down the illicit drug operation.
La police a fermé l'opération de drogue illicite.
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 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 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 verb /ɪnˈkɜːr/

incur

encourir
Meaning
To bring upon oneself something undesirable, usually as a result of actions.
Example
He incurred a fine for parking in the wrong place.
Il a encouru une amende pour avoir garé sa voiture au mauvais endroit.
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 adjective /ˌɪndɪˈskraɪbəbəl/

Indescribable

indescriptible
Meaning
impossible to describe or express in words; beyond description
Example
The beauty of the sunset was indescribable.
La beauté du coucher de soleil était indescriptible.
C1 noun /ɪnˈdaɪtmənt/

indictment

acte d'accusation
Meaning
a formal charge or accusation of a serious crime
Example
The indictment accused the company of multiple violations.
L'acte d'accusation a accusé l'entreprise de multiples violations.
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 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 /ɪnˈdʒʊəriəs/

injurious

nuisible
Meaning
Causing or likely to cause harm or damage.
Example
Smoking is injurious to health.
Fumer est nuisible à la santé.
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 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 adjective /ɪˈnɔːrdənət/

inordinate

excessif
Meaning
Excessive or unusually large in degree.
Example
She spent an inordinate amount of time on her phone.
Elle a passé un temps excessif sur son téléphone.
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 /ˈɪnbɔːrn/

Inborn

inné; congénital; inhérent
Meaning
existing from birth; natural; inherent
Example
She has an inborn talent for music.
Elle a un talent inné pour la musique.
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 adjective ˌɪn.trəˈspek.tɪv

introspective

introspectif
Meaning
Characterized by or given to introspection; examining one's own thoughts and feelings.
Example
Writers tend to be highly introspective individuals.
Les écrivains ont tendance à être des individus très introspectifs.
C1 adjective /ˌɪrɪˈspɛktɪv/

Irrespective

indifférent; sans tenir compte
Meaning
without taking something into account; regardless of
Example
All students will be treated equally, irrespective of their background.
Tous les étudiants seront traités de manière égale, indépendamment de leurs antécédents.
C1 adjective /ˌɪntərˈtwaɪnd/

intertwined

bonheur
Meaning
closely connected or twisted together
Example
Their lives became deeply intertwined after the accident.
Elle n'a pas pu cacher son bonheur lorsqu'elle a reçu le prix.
C1 noun /ɪnˈfɜː.mə.ti/

Infirmity

faiblesse; maladie; fragilité
Meaning
physical or mental weakness; a disease or ailment; frailty
Example
Despite his advanced age and various infirmities, he remained mentally sharp and alert.
Malgré son âge avancé et ses diverses infirmités, il est resté mentalement vif et alerte.
C1 verb /ɪnˈfleɪm/

inflame

enflammer
Meaning
to arouse strong feelings or provoke anger; to cause inflammation in the body
Example
The politician's remarks served to inflame public opinion.
Les remarques du politicien ont servi à enflammer l'opinion publique.
C1 adverb /ˌɪn.dɪˈskrɪm.ɪ.nət.li/

Indiscriminately

indiscriminément
Meaning
without making careful distinctions; randomly; without discrimination
Example
The company fired employees indiscriminately without considering their performance.
L'entreprise a licencié les employés indifféremment sans prendre en compte leur performance.
C1 adjective, noun /ɪnˈdɪkətɪv/

indicative

indicatif
Meaning
Serving as a sign or expression of something; in grammar, a mood used to make factual statements.
Example
His tone was indicative of his frustration.
Son ton était indicatif de sa frustration.
C1 noun /ɪnˈdʌstriəsnəs/

industriousness

diligence
Meaning
The quality of being hardworking and diligent.
Example
His industriousness earned him a promotion at work.
Sa diligence lui a valu une promotion au travail.
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 noun /ˈɪntrɪkəsi/

intricacy

complexité
Meaning
the quality of being very detailed or complicated
Example
The intricacy of the design impressed everyone.
La complexité du design a impressionné tout le monde.
C1 adjective /ˌɪnədˈvaɪzəbl/

inadvisable

déconseillé
Meaning
Not recommended; likely to have undesirable consequences.
Example
It is inadvisable to drive in such heavy rain.
Il est déconseillé de conduire sous une telle pluie forte.
C1 adjective /ˌɪnədˈvɜːrtənt/

inadvertent

involontaire, non intentionnel
Meaning
Not resulting from or achieved through deliberate planning; unintentional.
Example
Her inadvertent mistake caused a delay in the project.
Son erreur involontaire a causé un retard dans le projet.
C1 adjective /ˌɪnhɒˈspɪtəbl/

inhospitable

inhospitalier
Meaning
Harsh and difficult to live in; unfriendly or unwelcoming to guests.
Example
The desert is an inhospitable environment for most plants.
Le désert est un environnement inhospitalier pour la plupart des plantes.
C1 adjective /ˌaɪdiəˈlɪstɪk/

Idealistic

idéaliste
Meaning
pursuing high principles or ideals; unrealistically optimistic
Example
She has an idealistic view of changing the world.
Elle a une vision idéaliste de changer le monde.
C1 adjective /ɪˈrɛvəkəbl/

irrevocable

irrévocable
Meaning
Not able to be revoked, changed, or undone.
Example
She made an irrevocable decision to leave the company.
Elle a pris une décision irrévocable de quitter l'entreprise.
C1 noun ˌɪm.pʌlˈsɪv.ɪ.ti

impulsivity

impulsivité
Meaning
The tendency to act quickly and without thought or care; lack of self-control.
Example
His impulsivity led him to make reckless choices.
Son impulsivité l'a conduit à prendre des décisions imprudentes.
C1 adjective /aɪˈdɪlɪk/

idyllic

idyllique et magnifique
Meaning
Like an idyll; extremely happy, peaceful, or picturesque.
Example
They enjoyed an idyllic vacation by the sea.
Ils ont apprécié des vacances idylliques au bord de la mer.
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 adjective /ɪnˈdefɪnət/

Indefinite

indéfini
Meaning
not clearly defined; uncertain; vague; unlimited in time
Example
The meeting has been postponed for an indefinite period.
La réunion a été reportée pour une période indéfinie.
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 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 noun /ɪmˈpjʊərəti/

impurity

impureté
Meaning
the state of being unclean or contaminated; a substance that makes something impure
Example
The scientist removed every impurity from the water sample.
Le scientifique a éliminé chaque impureté de l’échantillon d’eau.
C1 adjective /ˌɪnkənˈsiːvəbl̩/

inconceivable

inconcevable
Meaning
Impossible to imagine or believe; beyond comprehension.
Example
It seemed inconceivable that she could finish the marathon after such little training.
Il semblait inconcevable qu'elle puisse finir le marathon après si peu d'entraînement.
C1 adjective /ɪˈneɪn/

inane

insensé, stupide
Meaning
lacking sense, meaning, or significance; silly or pointless
Example
The movie was criticized for its inane dialogue.
Le film a été critiqué pour ses dialogues insensés.
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 /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 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 ɪnˈdʒiː.ni.əs

ingenious

ingénieux
Meaning
Showing inventiveness and skill; clever, original, and inventive.
Example
His ingenious ideas transformed modern physics.
Ses idées ingénieuses ont transformé la physique moderne.
C1 noun /ɪnˈsɜːʃən/

insertion

insertion
Meaning
the action of inserting something into something else
Example
The insertion of the new data was completed successfully.
L'insertion des nouvelles données a été complétée avec succès.
C1 adjective /ˌɪlɪˈdʒɪtɪmət/

illegitimate

illégitime
Meaning
Not authorized by law, rules, or standards; not recognized as valid.
Example
The court ruled the contract to be illegitimate.
Le tribunal a jugé que le contrat était illégitime.
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 /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 verb /ˌɪntəˈsɛkt/

intersect

croiser
Meaning
to cross or pass through each other
Example
The two roads intersect at the city center.
Les deux routes se croisent au centre-ville.
C1 adjective ɪˈluː.sər.i

illusory

illusoire
Meaning
Based on illusion; not real although seeming to be.
Example
His sense of security was entirely illusory.
Son sentiment de sécurité était entièrement illusoire.
C1 verb /ɪnˈklaɪn/

incline

s'incliner
Meaning
to feel willing or favorably disposed toward something; to bend or tilt
Example
She is inclined to agree with the proposal.
Elle est inclinée à être d'accord avec la proposition.
C1 adjective /ˌɪməˈtɪəriəl/

immaterial

immatériel
Meaning
Not important or relevant; lacking physical substance.
Example
The judge ruled that the argument was immaterial to the case.
Le juge a statué que l'argument était immatériel pour l'affaire.
C1 adjective /ˌɪndɪˈskriːt/

indiscreet

imprudent
Meaning
Not careful in what one says or does, likely to reveal secrets or offend.
Example
It was indiscreet of him to mention the plan in public.
C'était imprudent de sa part de mentionner le plan en public.
C1 noun /ˌɪntərˈmiːdiˌɛri/

intermediary

intermédiaire
Meaning
A person who acts as a link between people in order to try to bring about an agreement; a mediator.
Example
The diplomat served as an intermediary between the two conflicting nations.
Le diplomate a agi comme intermédiaire entre les deux nations en conflit.
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 /ɪnˈstɪl/

instill

instiller
Meaning
to gradually but firmly establish an idea, attitude, or habit in someone's mind
Example
Parents try to instill good values in their children.
Les parents essaient d'inculquer de bonnes valeurs à leurs enfants.
C1 adjective /ɪmˈpɜːrtɪnənt/

impertinent

impertinent
Meaning
rude and showing a lack of respect
Example
It was impertinent of him to question the manager's decision.
C'était impertinent de sa part de remettre en question la décision du manager.
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 noun ˌɪnˈsaɪtfʊlnɪs

insightfulness

perspicacité, capacité d'analyse
Meaning
The capacity to gain an accurate and deep intuitive understanding of a person or thing.
Example
His insightfulness helped solve the complex problem.
Sa perspicacité a aidé à résoudre le problème complexe.
C1 noun /ˌɪnkwɪˈzɪʃən/

inquisition

inquisition
Meaning
A prolonged and intense questioning or investigation, often harsh in nature.
Example
The journalist faced an inquisition from the panel about his sources.
Le journaliste a fait face à une inquisition de la part du panel sur ses sources.
C1 noun /ˌɪntəkəˈnɛktɪvɪti/

interconnectivity

interconnexion
Meaning
The state of being interconnected or the degree of connectivity between components
Example
The rise of interconnectivity has transformed global communication.
L'essor de l'interconnectivité a transformé la communication mondiale.
C1 adjective /ɪnˈflæməbəl/

Inflammable

inflammable; combustible
Meaning
easily set on fire; flammable; combustible
Example
The inflammable material caught fire quickly.
Le matériau inflammable a pris feu rapidement.
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 verb /ɪmˈbɛd/

imbed

enfoncer
Meaning
To fix firmly or deeply in a surrounding mass.
Example
The journalist imbedded himself with the troops to report firsthand.
Le journaliste s'est enfoncé dans les troupes pour rapporter de première main.
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 adjective /ˈɪndɪɡoʊ bluː/

Indigo-blue

bleu indigo
Meaning
a deep blue color with a purplish tinge
Example
The indigo-blue sky looked magnificent at twilight.
Le ciel bleu indigo semblait magnifique au crépuscule.
C1 adjective /ɪnˈseɪʃəbl̩/

insatiable

insatiable
Meaning
impossible to satisfy; always wanting more
Example
Her insatiable curiosity drove her to read every book in the library.
Sa curiosité insatiable l'a poussée à lire tous les livres de la bibliothèque.
C1 adjective /ɪnˈhɪbɪtɪd/

inhibited

inhibé
Meaning
Unable to act in a relaxed and natural way, especially due to self-consciousness or restraint.
Example
He was too inhibited to express his true feelings.
Il était trop inhibé pour exprimer ses vrais sentiments.
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 ɪnˈtrɪn.zɪk

intrinsic

intrinsèque, essentiel, naturel
Meaning
Belonging naturally; essential. Existing as a natural or basic part of something.
Example
Creativity is an intrinsic quality of a great artist.
La créativité est une qualité intrinsèque d'un grand artiste.
C1 noun /ɪˌreɡjəˈlærɪti/

irregularity

irrégularité
Meaning
lack of regularity or consistency; a deviation from what is normal, expected, or orderly
Example
The audit revealed several financial irregularities in the company’s records.
L’audit a révélé plusieurs irrégularités financières dans les registres de l’entreprise.
C1 adjective /ˌɪndɪˈstrʌktəbl/

indestructible

indestructible
Meaning
Impossible to destroy or break.
Example
The superhero's shield was said to be indestructible.
On disait que le bouclier du super-héros était indestructible.
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 noun /ˌɪnkoʊˈhɪrəns/

incoherence

incohérence
Meaning
The quality of being unclear, confused, or lacking logical connection.
Example
His speech was full of incoherence and difficult to follow.
Son discours était plein d'incohérences et difficile à suivre.
C1 adjective /ɪnˈɡreɪnd/

ingrained

enraciné
Meaning
Firmly fixed or established; deeply rooted and difficult to change.
Example
His ingrained habits were hard to break.
Ses habitudes enracinées étaient difficiles à briser.
C1 adjective /ˈɪnfəməs/

infamous

infâme
Meaning
well known for some bad quality or deed
Example
The dictator was infamous for his cruelty.
Le dictateur était infâme pour sa cruauté.
C1 noun /ˌɪnɪkˈspɪəriəns/

inexperience

inexpérience
Meaning
Lack of knowledge or skill in a particular activity or field.
Example
His inexperience in handling negotiations was evident.
Son inexpérience dans la gestion des négociations était évidente.
C1 noun /ˌɪnkəmˈpliːtnəs/

incompleteness

incomplétude
Meaning
the state of not being complete or whole; lack of necessary parts or fullness
Example
The incompleteness of the report caused delays in the project.
L’incomplétude du rapport a causé des retards dans le projet.
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 /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 verb /ɪnˈfrɪndʒ/

infringe

enfreindre
Meaning
To actively break the terms of a law, agreement, or right.
Example
Copying this software without permission will infringe copyright laws.
Copier ce logiciel sans permission enfreindra les lois sur le droit d'auteur.
C1 noun ˌɪrɪˈvɜːrsəbl ˈdæmɪdʒ

irreversible damage

dommages irréversibles
Meaning
Harm or injury that cannot be undone or repaired.
Example
Climate change causes irreversible damage to ecosystems.
Le changement climatique cause des dommages irréversibles aux écosystèmes.
C1 verb /ˌɪnstɪˈtjuːʃənəlaɪz/

institutionalize

institutionnaliser
Meaning
to establish something as a formal institution, custom, or practice
Example
The government seeks to institutionalize environmental protection.
Le gouvernement cherche à institutionnaliser la protection de l'environnement.
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 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 verb /ɪnˈtɪmɪdeɪt/

intimidate

intimider
Meaning
To frighten or overawe someone, especially to make them do what one wants.
Example
The bully tried to intimidate the smaller kids.
Le harceleur a essayé d'intimider les enfants plus jeunes.
C1 noun /ɪmˈpɜː.mə.nəns/

impermanence

impermanence
Meaning
The state or fact of lasting for only a limited period of time.
Example
The philosophy of Buddhism emphasizes the impermanence of life.
La philosophie bouddhiste met l'accent sur l'impermanence de la vie.
C1 adjective /ɪnˈtɒl.ər.ə.bəl/

Intolerable

intolérable
Meaning
unable to be endured; extremely unpleasant or painful
Example
The noise from the construction site was intolerable.
Le bruit du chantier était intolérable.
C1 adjective /ɪnˈdiːsənt/

indecent

indécent
Meaning
not conforming to accepted standards of behavior or morality; improper or offensive
Example
He was warned for making an indecent remark during the meeting.
Il a été averti pour une remarque indécente.
C1 noun /ɪˌluːmɪˈneɪʃən/

illumination

éclairage
Meaning
the act of lighting something or making something clear
Example
The street was filled with bright illumination from the lamps.
La rue était éclairée par l'éclairage brillant des lampes.