inflow
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C1 noun /ˈɪn.floʊ/

inflow

afflux
Meaning
The movement of things such as money, people, or water into a place.
Example
The inflow of tourists boosted the local economy.
L'afflux de touristes a stimulé l'économie locale.
C1 adjective ˌɪn.təˈstel.ər

interstellar

entre les étoiles, interstellaire, cosmique
Meaning
Occurring or situated between stars.
Example
Scientists study interstellar travel possibilities.
Les scientifiques étudient les possibilités de voyages interstellaires.
C1 noun /ˌɪnkəmˌpætəˈbɪlɪti/

incompatibility

incompatibilité
Meaning
the state of being unable to exist or work together harmoniously; lack of compatibility
Example
The project failed because of incompatibility between the two software systems.
Le projet a échoué à cause de l’incompatibilité entre les deux systèmes logiciels.
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 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 /ɪˈlɒdʒ.ɪ.kəl/

Illogical

Illogique
Meaning
not reasonable or sensible; lacking logic
Example
It would be illogical to go swimming in such cold weather.
Il serait illogique d'aller nager par un temps aussi froid.
C1 adjective /ɪnˈses.ənt/

incessant

incessant
Meaning
Continuing without pause or interruption; constant.
Example
The incessant noise from the construction site made it hard to concentrate.
Le bruit incessant du chantier rendait la concentration difficile.
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 /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 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 /ɪnˈvɜːrt/

invert

inverser
Meaning
To turn something upside down or in the opposite position, order, or direction.
Example
He inverted the glass to let the water drain out.
Il a inversé le verre pour laisser l'eau s'écouler.
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 /ˌɪndɪˈskrɪmɪnət/

indiscriminate

indiscriminé
Meaning
Done without careful judgment; random or haphazard.
Example
The indiscriminate use of pesticides harms the environment.
L'utilisation indiscriminée de pesticides nuit à l'environnement.
C1 noun /ˈɪn.tə.lekt/

intellect

intellect
Meaning
The ability to think, reason, and understand objectively.
Example
Her intellect is admired by all her colleagues.
Son intellect est admiré par tous ses collègues.
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 /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 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 /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 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 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 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 /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 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 /ɪmˈpæsɪv/

impassive

impassible
Meaning
Not showing or feeling emotion; expressionless.
Example
Despite the shocking news, she remained impassive.
Malgré les nouvelles choquantes, elle est restée impassible.
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 /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 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 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 /ɪnˈsteɪbəl/

instable

instable
Meaning
not stable; liable to change, collapse, or fail; lacking firmness or reliability
Example
The instable political situation worried foreign investors.
La situation politique instable a inquiété les investisseurs étrangers.
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 /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, noun /ˈɪnvəlɪd/ (adjective), /ɪnˈvælɪd/ (noun)

invalid

invalide
Meaning
Not valid; having no force or effect. Also refers to a person too weak or ill to care for themselves.
Example
The court declared the contract invalid.
Le tribunal a déclaré le contrat invalide.
C1 verb /ɪnˈvælɪdeɪt/

invalidate

invalider
Meaning
To make something not valid or legally acceptable.
Example
The new evidence may invalidate the previous ruling.
La nouvelle preuve pourrait invalider la décision précédente.
C1 adjective ɪmˈpɛkəbl

impeccable

impeccable
Meaning
In accordance with the highest standards; faultless.
Example
His impeccable taste in fashion was admired by all his peers.
Son goût impeccable en mode était admiré par tous ses pairs.
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 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 /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 /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 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 verb /ɪmˈpɑːrt/

impart

transmettre
Meaning
to make information known; to bestow or communicate
Example
The teacher imparted valuable knowledge to her students.
L'enseignant a imparté des connaissances précieuses à ses élèves.
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 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 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 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 verb /ɪnˈvoʊk/

invoke

invoquer
Meaning
to call upon a higher power, authority, or principle for help, support, or justification
Example
The lawyer invoked the constitution to defend his client.
L'avocat a invoqué la constitution pour défendre son client.
C1 noun /ɪnˈfjuːʒən/

infusion

infusion
Meaning
the act of introducing something into another; a drink made by steeping leaves or herbs in liquid
Example
She prepared a calming infusion of chamomile tea.
Elle a préparé une infusion apaisante de thé à la camomille.
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 verb /ɪˈluːmɪneɪt/

illuminate

illuminer
Meaning
To light up or make something clearer.
Example
Streetlights illuminate the road at night.
Les réverbères illuminent la route la nuit.
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 /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 /ˈɪrɪtəbl/

irritable

irritable
Meaning
easily annoyed or made angry
Example
She became irritable after working long hours without rest.
Elle est devenue irritable après avoir travaillé de longues heures sans repos.
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 /ɪnˈtruː.ʒən/

intrusion

intrusion non autorisée
Meaning
Unauthorized entry into a system or place without permission
Example
The company detected an intrusion in its server.
L'entreprise a détecté une intrusion dans son serveur.
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 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 /ɪnˈkrɛdjələs/

incredulous

Meaning
unwilling or unable to believe something
Example
He gave her an incredulous look when she claimed she could fly.
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 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 /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 adjective /ˌɪntərˈtʃeɪndʒəbl/

interchangeable

interchangeable
Meaning
able to be exchanged with each other without difference or loss of function
Example
These machine parts are interchangeable, so they can be replaced easily.
Ces pièces de machine sont interchangeables, elles peuvent donc être remplacées facilement.
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 /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 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 /ˈɪɡ.ni.əs/

igneous

igné
Meaning
Formed through the cooling and solidification of magma or lava.
Example
Granite is an igneous rock commonly used in construction.
Le granit est une roche ignée couramment utilisée dans la construction.
C1 adjective /ɪnˈvæljʊəbl/

invaluable

inestimable
Meaning
Extremely useful or indispensable.
Example
Her advice proved invaluable to my success.
Son conseil s'est avéré inestimable pour mon succès.
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 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 /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 /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 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 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 /ˈɪŋ.krə.mənt/

Increment

augmentation
Meaning
an increase or addition, especially one of a series on a fixed scale; a regular increase in salary
Example
He received an annual increment of five percent in his salary this year.
Il a reçu une augmentation annuelle de cinq pour cent de son salaire cette année.
C1 adjective ɪn ˈfleɪ.ʃə.ner.i

inflationary

inflationniste
Meaning
Characterized by or tending to cause monetary inflation; relating to rising prices.
Example
The government took measures to control inflationary pressures.
Le gouvernement a pris des mesures pour contrôler les pressions inflationnistes.
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 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 noun /ˌɪm.pəˈzɪʃ.ən/

Imposition

imposition; charge; demande injuste
Meaning
the action or process of imposing something or of being imposed; an unfair burden or demand
Example
The imposition of new taxes without consultation angered the citizens greatly.
L'imposition de nouvelles taxes sans consultation a profondément enragé les citoyens.
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 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 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 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 /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 /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 /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 /ˈɪntərˌpleɪ/

interplay

interaction
Meaning
The way in which two or more things have an effect on each other.
Example
The interplay between culture and technology shapes modern life.
L'interaction entre la culture et la technologie façonne la vie moderne.
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 /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 noun /ɪˈmɜː.ʃən/

immersion

immersion
Meaning
Complete engagement in an environment or experience.
Example
Immersion in VR games makes users feel like they are inside the virtual world.
L'immersion dans les jeux en réalité virtuelle fait sentir aux utilisateurs qu'ils sont à l'intérieur du monde virtuel.
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 noun /ɪnˈkɒmpɪtəns/

incompetence

incompétence
Meaning
Lack of ability, skill, or effectiveness in doing something.
Example
The project failed due to the manager’s incompetence.
Le projet a échoué à cause de l'incompétence du manager.
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 /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 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 /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 /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 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 /ˌɪn.dʒəˈnjuː.ɪ.ti/

ingenuity

ingéniosité
Meaning
The quality of being clever, original, and inventive.
Example
His ingenuity led to groundbreaking innovations.
Son ingéniosité a conduit à des innovations de rupture.
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 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 verb /ɪnˈterəˌɡeɪt/

interrogate

interroger
Meaning
to ask someone questions in a thorough and formal way; to question intensively
Example
The police interrogated the suspect for hours.
La police a interrogé le suspect pendant des heures.
C1 adjective /ɪnˈkwɪzɪtɪv/

inquisitive

inquisitif
Meaning
Curious or eager to learn and ask questions.
Example
The inquisitive child asked endless questions about the stars.
L'enfant inquisitif a posé d'innombrables questions sur les étoiles.
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 /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 /ɪˈniː.bri.eɪ.tɪd/

inebriated

ivrogne
Meaning
under the influence of alcohol; drunk
Example
He stumbled into the room completely inebriated.
Il est entré dans la pièce complètement ivre.
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 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 /ˌɪnsəˈfɪʃənsi/

insufficiency

insuffisance
Meaning
The state of not being enough or not being adequate.
Example
The project failed due to the insufficiency of funds.
Le projet a échoué en raison de l'insuffisance des fonds.
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 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 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 /ɪnˈfɛst/

infest

infester
Meaning
to overrun in large numbers, especially so as to cause damage or discomfort
Example
The old house was infested with rats.
La vieille maison était infestée de rats.
C1 verb /ɪmˈpɜːrsəneɪt/

impersonate

imiter
Meaning
to pretend to be another person in order to entertain or deceive
Example
He was arrested for trying to impersonate a police officer.
Il a été arrêté pour avoir tenté d'usurper l'identité d'un policier.
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/verb /ˈɪnsɛns/

incense

encens / irriter
Meaning
a substance burned for its sweet smell (noun); to make very angry (verb)
Example
The smell of incense filled the temple, but his rude words incensed her.
L'odeur de l'encens remplissait le temple, mais ses mots impolis l'ont mise en colère.
C1 verb /ɪmˈpɒvərɪʃ/

impoverish

appauvrir
Meaning
To make someone poor or reduce the quality or richness of something.
Example
The long war impoverished the entire nation.
La longue guerre a appauvri toute la nation.
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 /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 /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 /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 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 /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 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.