infuriate
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C1 verb /ɪnˈfjʊərieɪt/

infuriate

mettre en colère
Meaning
To make someone extremely angry.
Example
His careless remarks infuriated the entire team.
Ses remarques imprudentes ont mis en colère toute l'équipe.
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 verb /ˈɪmprəvaɪz/

improvise

improviser
Meaning
To create or perform something spontaneously without preparation.
Example
The actor had to improvise his lines when he forgot the script.
L'acteur a dû improviser ses répliques lorsqu'il a oublié le script.
C1 adverb /ɪnˈvɜːrs.li/

Inversely

inversement; de manière opposée
Meaning
in a way that is opposite or contrary; in reverse order or manner
Example
The price of goods is inversely related to their availability in the market.
Le prix des biens est inversement lié à leur disponibilité sur le marché.
C1 verb /ˈɪrɪˌɡeɪt/

irrigate

arroser
Meaning
to supply water to land or crops; to wash out a wound with water
Example
Farmers irrigate their fields during dry seasons.
Les agriculteurs irriguent leurs champs pendant les saisons sèches.
C1 adjective /ˈɪmpjəd(ə)nt/

impudent

imprudent, insolent
Meaning
not showing due respect for another person; rude
Example
The impudent child talked back to the teacher.
L'enfant impudent a répondu au professeur.
C1 noun /ˈɪnflʌks/

influx

afflux
Meaning
A large arrival or flow of people or things.
Example
The city experienced an influx of tourists during the festival.
La ville a connu un afflux de touristes pendant le festival.
C1 adjective ˌɪn.təˈmɪt.ənt

intermittent

intermittent
Meaning
Happening irregularly, not continuously.
Example
The rain was intermittent throughout the day.
La pluie était intermittente toute la journée.
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 noun /ˈɪmɪnəns/

imminence

imminence, état de proximité
Meaning
the state of being about to happen
Example
The imminence of the storm forced people to take shelter.
L'imminence de la tempête a forcé les gens à chercher un abri.
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 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 /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 /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, 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 adjective /ɪˈlʌstriəs/

illustrious

illustre
Meaning
Well known, respected, and admired for past achievements.
Example
She had an illustrious career in medicine.
Elle avait une carrière illustre en médecine.
C1 noun /ˈɪmɪdʒəri/

imagery

imagerie
Meaning
visually descriptive or figurative language, especially in a literary work
Example
The poet's use of imagery brought the scene to life.
L'utilisation de l'imagerie par le poète a donné vie à la scène.
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 /ɪnˈsɒlvənt/

insolvent

insolvable
Meaning
unable to pay debts owed
Example
The insolvent firm could not meet its financial obligations.
L'entreprise insolvable n'a pas pu remplir ses obligations financières.
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 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 /ˈɪn.tə.mə.si/

Intimacy

intimité; proximité
Meaning
close familiarity or friendship; closeness; a private cozy atmosphere
Example
The couple valued the emotional intimacy they shared more than material possessions.
Le couple a plus apprécié l'intimité émotionnelle qu'ils partageaient que les biens matériels.
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 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 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 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 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 /ɪnˈvɪnsəbl/

invincible

invincible
Meaning
too powerful to be defeated or overcome
Example
The team seemed invincible after winning ten matches in a row.
L'équipe semblait invincible après avoir gagné dix matchs d'affilée.
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 /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 /ˌɪrɪˈvɜːrsəbl/

irreversible

irréversible
Meaning
Not able to be undone, changed, or reversed.
Example
The damage caused by the fire was irreversible.
Les dommages causés par le feu étaient irréversibles.
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 verb /ˈɪnkjʊˌbeɪt/

incubate

incuber
Meaning
to keep eggs, cells, or organisms at the right conditions for development
Example
The hen will incubate the eggs until they hatch.
La poule incubera les œufs jusqu'à ce qu'ils éclosent.
C1 noun /ɪmˈbæl.əns/

Imbalance

déséquilibre
Meaning
lack of proportion or relation between corresponding things; unequal distribution
Example
The doctor said the patient's dizziness was caused by an inner ear imbalance.
Le docteur a dit que les vertiges du patient étaient causés par un déséquilibre dans l'oreille interne.
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 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 /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 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 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 verb ɪmˈbjuː

Imbue

Mélanger une idée ou un sentiment profondément dans l'esprit de quelqu'un
Meaning
Mixing some idea or feeling deeply into someone's mind
Example
The teacher tried to imbue students with a love for learning.
L'enseignant a essayé d'inculquer aux élèves un amour de l'apprentissage.
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 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 adjective /ˌɪnəˈtɛntɪv/

inattentive

inattentif
Meaning
not paying attention; lacking focus or concentration
Example
The inattentive student missed several important instructions.
L'étudiant inattentif a manqué plusieurs consignes importantes.
C1 adjective /ɪˈnɛpt/

inept

inepte
Meaning
lacking skill or ability; clumsy or incompetent
Example
His inept handling of the situation made it worse.
Sa gestion inepte de la situation a empiré les choses.
C1 adverb, adjective /ˌɪnkɑːɡˈniːtoʊ/

incognito

incognito
Meaning
In disguise or with one's identity concealed.
Example
The celebrity traveled incognito to avoid the paparazzi.
La célébrité a voyagé incognito pour éviter les paparazzis.
C1 noun ˌɪnfɛsˈteɪʃən

infestation

infestation, présence anormalement élevée d'insectes ou d'animaux dans un endroit
Meaning
The presence of an unusually large number of insects or animals in a place, causing damage or disease.
Example
The infestation of ants in the kitchen led to immediate pest control measures.
L'infestation de fourmis dans la cuisine a conduit à des mesures immédiates de contrôle des nuisibles.
C1 adjective /ɪnˈveə.ri.ə.bəl/

Invariable

invariable; constant; toujours le même
Meaning
never changing; constant; always the same
Example
His invariable routine includes morning exercise and coffee.
Sa routine invariable comprend des exercices matinaux et du café.
C1 adjective /ɪnˈstrʌktɪv/

instructive

instructif
Meaning
useful and informative; providing knowledge or instruction
Example
The lecture was highly instructive and engaging.
La conférence était très instructive et captivante.
C1 noun /ˈɪrɪtənt/

irritant

substance irritante
Meaning
something that causes irritation or discomfort
Example
Dust is a common irritant for people with allergies.
La poussière est un irritant commun pour les personnes allergiques.
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 adjective /ˌɪn.səˈbɔːr.dɪ.nət/

insubordinate

insubordonné
Meaning
Defiant of authority; disobedient to orders.
Example
The insubordinate employee refused to follow the manager's instructions.
L'employé insubordonné a refusé de suivre les instructions du gestionnaire.
C1 verb /ɪnˈdʌkt/

induct

admettre formellement quelqu'un dans une position, organisation ou bureau
Meaning
to formally admit someone into a position, organization, or office
Example
She was inducted into the university's honor society.
Elle a été admise dans la société d'honneur de l'université.
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 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 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 /ˌɪnstənˈteɪniəs/

instantaneous

instantané
Meaning
Happening immediately, without any delay.
Example
The change in temperature was almost instantaneous.
Le changement de température a été presque instantané.
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 noun /ɪnˈkɜːrʒən/

incursion

incursion
Meaning
A sudden attack or invasion into a place or territory.
Example
The army repelled the enemy incursion at the border.
L'armée a repoussé l'incursion ennemie à la frontière.
C1 verb /ɪmˈpɛl/

impel

inciter
Meaning
to drive, force, or urge someone to do something
Example
Her curiosity impelled her to open the mysterious box.
Sa curiosité l'a poussée à ouvrir la boîte mystérieuse.
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 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 noun ɪnˌten.sɪ.fɪˈkeɪ.ʃən

intensification

intensification
Meaning
The process of becoming or making something more intense or extreme.
Example
The intensification of climate change requires urgent action.
L'intensification du changement climatique nécessite une action urgente.
C1 adjective /ɪnˈkɒmp(ə)rəbl/

incomparable

incomparable
Meaning
Without an equal in quality or excellence; matchless.
Example
The view from the mountain was incomparable.
La vue depuis la montagne était incomparable.
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 /ɪmˈpiːtʃ/

impeach

destituer
Meaning
To charge a public official with misconduct while in office.
Example
The parliament voted to impeach the president.
Le parlement a voté pour destituer le président.
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 ˌɪdiəsɪnˈkrætɪk

idiosyncratic

particulier et individuel
Meaning
Relating to idiosyncrasy; peculiar or individual.
Example
His idiosyncratic behavior set him apart from his colleagues.
Son comportement idiosyncratique le distinguait de ses collègues.
C1 verb /ɪnˈtɒksɪkeɪt/

intoxicate

bonheur
Meaning
to make someone lose control of their faculties or behavior due to alcohol or drugs
Example
The strong drink quickly intoxicated him.
Elle n'a pas pu cacher son bonheur lorsqu'elle a reçu le prix.
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 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 /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 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 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 /ˌɪnkɑːrˈneɪʃən/

incarnation

incarnation
Meaning
the embodiment of a deity, spirit, or quality in a physical form
Example
The monk was considered the incarnation of compassion.
Le moine était considéré comme l'incarnation de la compassion.
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 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 /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 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 verb /ɪnˈfleɪt/

inflate

gonfler
Meaning
to fill with air or gas so it expands; to increase excessively or artificially
Example
The mechanic inflated the tire to the correct pressure.
Le mécanicien a gonflé le pneu à la bonne pression.
C1 adjective /ˌɪnækˈsɛsəbl/

inaccessible

inaccessible
Meaning
unable to be reached, entered, or understood
Example
The remote village is almost inaccessible during the rainy season.
Le village éloigné est presque inaccessible pendant la saison des pluies.
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 /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 noun /ɪˈmiːdiəsi/

immediacy

immédiateté, urgence
Meaning
The quality of bringing one into direct and instant involvement with something, giving rise to a sense of urgency or excitement.
Example
The immediacy of digital communication has reshaped business operations.
L'immédiateté de la communication numérique a transformé les opérations commerciales.
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; noun /ɪˈmɔːrtl/

immortal

immortel
Meaning
living forever; never dying; lasting forever in fame or memory
Example
Legends often describe heroes as immortal beings who never die.
Les légendes parlent d’êtres immortels.
C1 adjective /ɪnˈflɛksəbl/

inflexible

inflexible
Meaning
Not able to bend or change; unwilling to change ideas or behavior.
Example
His inflexible attitude made negotiations difficult.
Son attitude inflexible rendait les négociations difficiles.
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 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 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 noun /ˌɪntərˌɒpərəˈbɪləti/

interoperability

interopérabilité
Meaning
The ability of computer systems or software to exchange and make use of information.
Example
The interoperability of different software systems ensures seamless workflow.
L'interopérabilité des différents systèmes logiciels garantit un flux de travail fluide.
C1 adjective /ɪmˈpoʊzɪŋ/

imposing

imposant
Meaning
having an appearance that is grand, impressive, or commanding
Example
The castle is an imposing structure overlooking the valley.
Le château est une structure imposante qui surplombe la vallée.
C1 verb /ɪnˈskraɪb/

inscribe

graver
Meaning
to write or carve words or symbols on a surface
Example
They inscribed her name on the trophy.
Ils ont gravé son nom sur le trophée.
C1 adjective /ˌɪntəˈrɑːɡətɪv/

interrogative

interrogatif
Meaning
Relating to or conveying a question; in grammar, used to form questions.
Example
She raised an interrogative eyebrow when she heard the news.
Elle haussa un sourcil interrogatif lorsqu'elle entendit la nouvelle.
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 /aɪˈtɪnərɛri/

itinerary

itinéraire
Meaning
A planned route or schedule of a journey or trip.
Example
The travel agent gave us a detailed itinerary for our vacation.
L'agent de voyages nous a donné un itinéraire détaillé pour nos vacances.
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.
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 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 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 noun /ˌɪn.səˌbɔːr.dɪˈneɪ.ʃən/

insubordination

insubordination
Meaning
Defiance of authority; refusal to obey orders.
Example
The soldier was punished for insubordination during the mission.
Le soldat a été puni pour insubordination pendant la mission.
C1 adjective /ɪnˈedəbəl/

Inedible

incomestible
Meaning
not suitable or safe for eating; not edible
Example
The mushrooms were poisonous and completely inedible.
Les champignons étaient venimeux et complètement inédibles.
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 /ˌɪnsɪɡˈnɪfɪkəns/

insignificance

insignifiance
Meaning
The quality of being unimportant or trivial.
Example
He felt a sense of insignificance in the vast universe.
Il ressentait un sentiment d'insignifiance dans l'immensité de l'univers.
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 noun ˌɪntədɪˈpɛndənsi

interdependency

interdépendance
Meaning
The dependence of two or more people or things on each other.
Example
The interdependency of the countries led to greater cooperation.
L'interdépendance des pays a conduit à une coopération accrue.
C1 noun/verb /ˈɪmprɪnt/

imprint

empreinte
Meaning
A mark or impression made by pressure; to establish or fix firmly in someone's mind.
Example
The event left an indelible imprint on the city's history.
L'événement a laissé une empreinte indélébile dans l'histoire de la ville.
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 /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 noun /ɪnˈtɛstɪn/

intestine

intestin
Meaning
The part of the digestive system where food is digested and absorbed, extending from the stomach to the anus.
Example
The doctor explained how nutrients are absorbed in the small intestine.
Le médecin a expliqué comment les nutriments sont absorbés dans l'intestin grêle.
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 adjective /ɪˈledʒ.ə.bəl/

illegible

illisible
Meaning
Not clear enough to be read; unreadable.
Example
The doctor’s handwriting was almost illegible.
L'écriture du médecin était presque illisible.
C1 adjective /ɪnˈsʌf.ər.ə.bəl/

insufferable

insupportable
Meaning
Too extreme to bear; intolerable.
Example
The heat during the summer was insufferable.
La chaleur pendant l'été était insupportable.
C1 noun /ɪnˈdʒʌŋkʃən/

injunction

injonction
Meaning
A judicial order restraining a person from an action or compelling a certain act.
Example
The court issued an injunction to stop the company from polluting the river.
Le tribunal a émis une injonction pour empêcher l'entreprise de polluer la rivière.
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 /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 adjective /aɪˈreɪt/

irate

furieux
Meaning
Extremely angry.
Example
The customer became irate after waiting for hours.
Le client est devenu furieux après avoir attendu pendant des heures.
C1 verb /ɪmˈpɪndʒ/

impinge

affecter
Meaning
to have an effect or impact on something; to encroach or infringe
Example
The noise from the construction site impinges on our daily activities.
Le bruit du chantier impacte nos activités quotidiennes.
C1 adjective /ˌɪnˌkɒnsɪˈkwɛnʃəl/

inconsequential

insignifiant
Meaning
Not important or significant; too small to matter.
Example
The mistake was minor and inconsequential.
L'erreur était mineure et insignifiante.
C1 noun /ˌɪnklɪˈneɪʃən/

inclination

inclination
Meaning
A natural tendency or urge to act or feel in a particular way.
Example
She has an inclination towards helping others.
Elle a une inclination à aider les autres.
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 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.