inefficacious
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C2 adjective ˌɪn.ɪ.fɪˈkeɪ.ʃəs

inefficacious

inefficace
Meaning
Not producing any or the desired effect; ineffective.
Example
The treatment was inefficacious in curing the disease.
Le traitement a été inefficace pour guérir la maladie.
C2 noun /ˈɪmpjʊdəns/

impudence

impudence
Meaning
Rude and disrespectful behavior.
Example
The student's impudence shocked the entire class.
L'impudence de l'étudiant a choqué toute la classe.
C2 adjective /ˌɪmpəˈmɪsəbl/

impermissible

interdit
Meaning
Not permitted or allowed.
Example
Such behavior is impermissible in the workplace.
Un tel comportement est interdit sur le lieu de travail.
B2 noun /ˌɪntərˈfɪərəns/

interference

interférence
Meaning
the action of interfering with something
Example
The radio signal was disrupted due to interference from nearby electronics.
Le signal radio a été perturbé en raison de l'interférence des appareils électroniques à proximité.
B2 noun ɪnˈsɛntɪvz

incentives

incitations, incitatifs
Meaning
Things that motivate or encourage one to do something.
Example
Tax incentives are used to encourage investment in renewable energy.
Les incitations fiscales sont utilisées pour encourager les investissements dans l'énergie renouvelable.
C2 adjective /ɪnˈvɪdiəs/

invidious

envieux
Meaning
likely to arouse resentment, envy, or anger in others
Example
The manager's invidious remarks created tension among the employees.
Les remarques envieuses du manager ont créé des tensions parmi les employés.
B2 noun /ɪnˈtɜː.prə.tər/

Interpreter

interprète; traducteur;
Meaning
a person who translates orally from one language into another; someone who explains meaning
Example
The international conference hired professional interpreters to translate speeches in real time.
La conférence internationale a embauché des interprètes professionnels pour traduire les discours en temps réel.
C2 adjective/noun /ɪnˈkɑːrnədiːn/

incarnadine

rouge incarnat
Meaning
a bright crimson or pinkish-red color
Example
The sky turned incarnadine at sunset.
Le ciel est devenu rouge incarnat au coucher du soleil.
B2 adverb /ɪmˈpɒlɪtli/

impolitely

impoliment
Meaning
in a rude or discourteous manner; without showing respect or proper manners
Example
He spoke impolitely to the waiter despite the polite service.
Il a parlé impoliment au serveur malgré le bon service.
B2 adjective /ˈɪmɪnənt/

imminent

imminent
Meaning
About to happen; likely to occur very soon.
Example
Dark clouds signaled that a storm was imminent.
Les nuages sombres ont signalé qu'une tempête était imminente.
B1 noun /ˌɪntərˈækʃən/

interaction

interaction mutuelle
Meaning
The process of people or things acting upon or influencing each other.
Example
The teacher encouraged more interaction between students.
L'enseignant a encouragé plus d'interaction entre les élèves.
C1 adjective /ɪnˈhɛrənt/

inherent

inhérent
Meaning
Existing in something as a natural, permanent, or essential quality.
Example
There are inherent risks in extreme sports.
Il existe des risques inhérents dans les sports extrêmes.
C2 verb ˈɪn.kʌl.keɪt

inculcate

inculquer
Meaning
Instill an attitude, idea, or habit by persistent instruction; to teach and impress by frequent repetitions.
Example
Parents should inculcate good values in their children.
Les parents devraient inculquer de bonnes valeurs à leurs enfants.
C2 noun /ˌɪməʊˈbɪləti/

immobility

immobilité
Meaning
The state of being unable to move.
Example
After the accident, she suffered from immobility in her legs.
Après l'accident, elle a souffert d'immobilité dans ses jambes.
C2 adjective /ˌɪnkəmˈprɛsəbl/

incompressible

incompressible
Meaning
Not able to be pressed or squeezed into a smaller space.
Example
Liquids are generally considered incompressible.
Les liquides sont généralement considérés comme incompressibles.
A2 adverb /ˌɪnˈdɔːrz/

indoors

à l’intérieur
Meaning
inside a building; within an enclosed space
Example
Because of the rain, everyone stayed indoors.
À cause de la pluie, tout le monde est resté à l’intérieur.
C2 adjective ɪnˈfiː.zə.bəl

infeasible

infaisable
Meaning
Not possible to do easily or conveniently; impracticable.
Example
Restoring the forest may become infeasible if destruction continues.
Restaurer la forêt peut devenir infaisable si la destruction continue.
C2 noun /ˈɪnfəmi/

infamy

bonheur
Meaning
the state of being well known for some bad quality or deed
Example
His name will live in infamy for the crimes he committed.
Elle n'a pas pu cacher son bonheur lorsqu'elle a reçu le prix.
B2 adjective /ˌɪnsɪɡˈnɪfɪkənt/

insignificant

insignifiant
Meaning
Too small or unimportant to be worth considering.
Example
The cost was so insignificant that nobody noticed it.
Le coût était tellement insignifiant que personne ne l'a remarqué.
C2 adjective /ˌɪnkɔːrˈpɔːriəl/

incorporeal

incorporel
Meaning
lacking a physical body; not composed of matter; intangible
Example
Ghosts are often described as incorporeal beings.
Les fantômes sont souvent décrits comme des êtres incorporels.
C2 verb /ˈɪməleɪt/

immolate

immoler
Meaning
To kill or sacrifice, especially by burning.
Example
The protesters threatened to immolate themselves in front of the building.
Les manifestants ont menacé de s'immoler devant le bâtiment.
B1 noun /ɪnˈɡriːdiənt/

ingredient

ingrédient
Meaning
A component part or element of something, especially in a recipe.
Example
Flour is a key ingredient in baking bread.
La farine est un ingrédient clé pour faire du pain.
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 /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 /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.
B2 noun /ɪnˈtɪəriər/

interior

intérieur
Meaning
the inside part of something; inner area of a place or object
Example
The interior of the hotel was beautifully decorated.
L'intérieur de l'hôtel était magnifiquement décoré.
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.
C2 noun /ˌɪntərˈsɛsər/

intercessor

intercesseur
Meaning
a person who intervenes or pleads on behalf of another
Example
He acted as an intercessor to resolve the conflict between the two families.
Il a agi en tant qu'intercesseur pour résoudre le conflit entre les deux familles.
B2 noun /aɪˌdɛntɪfɪˈkeɪʃən/

identification

identification
Meaning
the process of recognizing or proving who or what someone or something is
Example
You need proper identification to enter the building.
Vous avez besoin d'une identification appropriée pour entrer dans le bâtiment.
B2 adjective /ɪnˈfɪə.ri.ər/

inferior

inférieur
Meaning
Of lower quality, rank, or status.
Example
This material is inferior to the one we used before.
Ce matériau est inférieur à celui que nous avons utilisé auparavant.
C2 adjective /ɪmˈprɛɡnəbl̩/

impregnable

imprenable
Meaning
Unable to be captured, broken into, or defeated.
Example
The fortress was considered impregnable by the enemy.
La forteresse était considérée comme imprenable par l'ennemi.
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 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.
C2 verb /ɪˈreɪdieɪt/

irradiate

irradier
Meaning
to shine light on something; to expose to radiation; to illuminate or brighten
Example
The scientist used a lamp to irradiate the sample.
Le scientifique a utilisé une lampe pour irradier l'échantillon.
C2 adjective /ɪmˈperɪʃəbəl/

Imperishable

imperissable; éternel; immortel
Meaning
not subject to decay; lasting forever; eternal
Example
The imperishable beauty of classical art continues to inspire generations.
La beauté impérissable de l'art classique continue d'inspirer les générations.
B2 adjective ˈaɪsəˌleɪtɪd

isolated

isolé
Meaning
Alone or separated from others; having little or no contact with other people.
Example
Technological advancements often leave people isolated.
Les progrès technologiques isolent souvent les gens.
C1 verb /ˈɪmplɪˌkeɪt/

implicate

impliquer
Meaning
To show someone’s involvement in a crime or wrongdoing.
Example
The evidence implicated several officials in the scandal.
Les preuves ont impliqué plusieurs responsables dans le scandale.
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 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.
C2 adjective /ˌɪntəˈrɒɡətəri/

interrogatory

interrogatif
Meaning
expressed in the form of a question; relating to questioning
Example
The lawyer’s interrogatory tone made the witness uncomfortable.
Le ton interrogatif de l'avocat a rendu le témoin mal à l'aise.
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.
B1 adverb /ˈɪnstəntli/

instantly

instantanément
Meaning
immediately, without any delay
Example
He replied instantly to the message.
Il a répondu instantanément au message.
C1 noun /ɪˈrɛlɪvənsi/

irrelevancy

irrélevance
Meaning
the state of being unrelated or unimportant to the matter at hand
Example
The judge dismissed the argument because of its irrelevancy to the case.
Le juge a rejeté l’argument en raison de son irrélevance pour l’affaire.
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 /ɪnˈdɪf.ər.əns/

Indifference

indifférence; désintérêt; apathie
Meaning
lack of interest, concern, or sympathy; the state of not caring about something
Example
His indifference to his studies resulted in poor grades throughout the semester.
Son indifférence à ses études a conduit à de mauvaises notes tout au long du semestre.
B2 noun ˌɪr.ɪˈɡeɪ.ʃən

irrigation

irrigation
Meaning
The artificial application of water to land or soil.
Example
Irrigation systems improve crop yields in dry regions.
Les systèmes d'irrigation améliorent les rendements des cultures dans les régions sèches.
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.
C2 verb /ɪˈnjʊər/

inure

habituer
Meaning
To become accustomed to something, especially something unpleasant.
Example
Soldiers quickly became inured to the harsh conditions.
Les soldats se sont rapidement habitués aux conditions difficiles.
C2 noun /ɪnˈsɪpiəns/

incipience

début
Meaning
the beginning or initial stage of something
Example
The project was still in its incipience when funding was approved.
Le projet en était encore à ses débuts lorsque le financement a été approuvé.
C2 adverb /ˈɪntʃmiːl/

inchmeal

petit à petit
Meaning
Gradually, little by little.
Example
The old castle fell inchmeal into ruin.
Le vieux château est tombé petit à petit en ruine.
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.
C2 adjective /ɪnˈkɒrɪdʒəbəl/

incorrigible

incorrigible
Meaning
incapable of being corrected, improved, or reformed
Example
He is an incorrigible optimist who never loses hope.
C'est un optimiste incorrigible qui ne perd jamais espoir.
C2 noun /ɪmˈpɒs.tʃər/

Imposture

imposture; fraude; tromperie
Meaning
the practice of deceiving others by pretending to be someone else; fraudulent deception
Example
The elaborate imposture lasted for months before investigators uncovered the truth.
L'imposture élaborée a duré des mois avant que les enquêteurs ne découvrent la vérité.
C1 adjective /ɪmˈpɛndɪŋ/

impending

imminent
Meaning
about to happen soon, usually something unpleasant or threatening
Example
The villagers were worried about the impending flood.
Les villageois étaient inquiets de l'inondation imminente.
C2 noun /aɪˈdɒlətri/

idolatry

idolâtrie
Meaning
The worship of idols or extreme admiration for someone or something.
Example
The priest condemned the idolatry practiced in the village.
Le prêtre a condamné l'idolâtrie pratiquée dans le village.
B2 adjective /ɪmˈper.ə.tɪv/

imperative

impératif
Meaning
Of vital importance; crucial; giving or expressing a command.
Example
It is imperative to address the climate crisis immediately.
Il est impératif de traiter immédiatement la crise climatique.
B1 noun /ɪnˈstrʌkʃənz/

instructions

instructions
Meaning
Detailed information on how something should be done or operated.
Example
Please follow the instructions on the box.
Veuillez suivre les instructions sur la boîte.
C2 noun /ˌɪn.trəˈɡreʃ.ən/

introgression

introgression génétique
Meaning
The transfer of genetic information from one species to another through repeated backcrossing.
Example
Introgression plays a significant role in plant breeding.
L'introgression joue un rôle important dans la reproduction des plantes.
C2 verb /ˈɪmprɪkeɪt/

imprecate

imprécation
Meaning
To utter a curse or invoke evil upon someone.
Example
The old woman imprecated her enemies with dark words.
La vieille femme a impréqué ses ennemis avec des mots sombres.
A2 verb /ɪɡˈnɔːr/

ignore

ignorer
Meaning
to refuse to take notice of; to disregard intentionally
Example
She decided to ignore the rude comments.
Elle a décidé d'ignorer les commentaires désobligeants.
C2 noun /ɪnˈhɪərəns/

inherence

inhérence
Meaning
The state of being an essential or permanent part of something.
Example
The inherence of risk is part of every business venture.
L'inhérence du risque fait partie de chaque aventure d'entreprise.
B2 adjective /ˌɪnkəmˈpliːt/

incomplete

incomplet
Meaning
Not finished, lacking some parts or not whole.
Example
Her report was incomplete and needed further details.
Son rapport était incomplet et nécessitait des détails supplémentaires.
B2 adjective /ɪnˈtɛns/

intense

intense
Meaning
Of extreme force, degree, or strength.
Example
She felt intense pain after the accident.
Elle a ressenti une douleur intense après l'accident.
B2 adjective /ˌɪntəˈpɜːsənl/

interpersonal

interpersonnel
Meaning
Relating to relationships or communication between people.
Example
He has excellent interpersonal skills and gets along well with others.
Il a d'excellentes compétences interpersonnelles et s'entend bien avec les autres.
B1 adjective /ɪnˈvɑːlvd/

involved

impliqué
Meaning
complicated or engaged in something
Example
She was deeply involved in community service.
Elle était profondément impliquée dans le service communautaire.
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.
B2 verb /ɪnˈsɜːrt/

insert

insérer
Meaning
to put or place something into something else
Example
Please insert the key into the lock.
veuillez insérer la clé dans la serrure.
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.
C2 noun /ɪmp/

imp

petit diablotin espiègle
Meaning
a small mischievous devil or sprite; a playful troublemaker
Example
The child was acting like a little imp, hiding his toys everywhere.
L'enfant agissait comme un petit diablotin, cachant ses jouets partout.
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.
B2 adjective /ˈɪrɪteɪtɪd/

irritated

irrité
Meaning
feeling annoyed or impatient; having inflamed or sore physical condition
Example
She felt irritated by the constant noise outside her window.
Elle était irritée par le bruit constant à l’extérieur.
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 adjective /ɪmˈpɜːrsənl/

impersonal

impersonnel
Meaning
not influenced by, showing, or involving personal feelings; lacking human warmth or emotion
Example
The letter was written in a very impersonal style.
La lettre a été écrite dans un style très impersonnel.
B2 noun /ˈɪn.vɔɪs/

Invoice

facture
Meaning
a list of goods sent or services provided, with a statement of the sum due for these
Example
The company sent an invoice for the office supplies delivered last week.
L'entreprise a envoyé une facture pour les fournitures de bureau livrées la semaine dernière.
B1 adjective /ɪˈnɪʃəl/

initial

initial
Meaning
Existing or occurring at the beginning.
Example
Her initial reaction was one of surprise.
Sa réaction initiale fut une surprise.
A1 adjective /ɪmˈpɔː.tənt/

important

important
Meaning
Of great significance or value; likely to have a profound effect on success, survival, or well-being.
Example
Important steps must be taken to address pollution.
Des mesures importantes doivent être prises pour résoudre la pollution.
C2 noun /ˌɪkθiˈɒlədʒi/

ichthyology

ichtyologie
Meaning
The branch of zoology that deals with fish.
Example
He pursued a degree in ichthyology at the university.
Il a poursuivi un diplôme en ichtyologie à l'université.
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.
C2 adjective /ɪmˈpɒndərəbl̩/

imponderable

impondérable
Meaning
Something difficult or impossible to estimate, assess, or understand
Example
The outcome of the election depends on many imponderable factors.
Le résultat des élections dépend de nombreux facteurs impondérables.
C2 noun /ˌɪdiəˈsɪŋkrəsi/

idiosyncrasy

idiosyncrasie
Meaning
A distinctive or peculiar characteristic, habit, or mannerism unique to an individual.
Example
One of her idiosyncrasies was humming while working.
L'une de ses idiosyncrasies était de fredonner en travaillant.
C2 adjective /ɪnˈvɛtərət/

inveterate

invétéré
Meaning
having a long-established habit, activity, or interest that is unlikely to change
Example
He is an inveterate reader who spends hours in the library every day.
Il est un lecteur invétéré qui passe des heures à la bibliothèque chaque jour.
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.
A2 noun /ˈɪnfoʊ/

info

information
Meaning
information; knowledge or facts about something or someone
Example
She gave me all the info I needed for the meeting.
Elle m'a donné toutes les informations nécessaires pour la réunion.
B2 adjective /ˈaɪsi/

Icy

gelé; extrêmement froid; hostile
Meaning
extremely cold; covered with ice; unfriendly or hostile
Example
The icy wind made everyone shiver.
Le vent glacé a fait trembler tout le monde.
B1 adjective /ˌɪnɪkˈspɛnsɪv/

Inexpensive

bon marché; abordable; économique
Meaning
not costing a lot of money; affordable; budget-friendly
Example
This restaurant offers delicious and inexpensive meals for students.
Ce restaurant propose des repas délicieux et bon marché pour les étudiants.
B1 verb /ɪnˈfɔ:m/

inform

informer
Meaning
to tell someone about something; to give information
Example
Please inform me when you arrive at the airport.
s'il vous plaît, informez-moi lorsque vous arrivez à l'aéroport.
C2 noun /ɪmˈpjuːɪsəns/

impuissance

impuissance
Meaning
inability to take effective action; helplessness
Example
The government’s impuissance in the face of crisis frustrated the people.
L’impuissance du gouvernement face à la crise a frustré la population.
C2 adjective /ˌɪnæprɪˈhɛnsəbl/

inapprehensible

incompréhensible
Meaning
not understandable; incomprehensible
Example
The concept was so abstract that it seemed inapprehensible to most students.
Le concept était si abstrait qu'il semblait incompréhensible pour la plupart des étudiants.
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 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 /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.
C2 verb /ɪnˈsteɪt/

instate

installer
Meaning
To set up in position, office, or authority.
Example
The board decided to instate her as the new director.
Le conseil a décidé de l'instaurer en tant que nouveau directeur.
C2 noun /ɪˌluːmɪˈnɑːti/

illuminati

illuminati
Meaning
a group of people claiming to have special enlightenment or secret knowledge, often linked to conspiracies
Example
Many conspiracy theories involve the Illuminati as a secret world-controlling group.
De nombreuses théories du complot impliquent les Illuminati comme un groupe secret contrôlant le monde.
C2 verb /ɪnˈdaɪt/

indite

composer
Meaning
To write or compose (literary or formal works).
Example
The poet indited a heartfelt sonnet.
Le poète a composé un sonnet sincère.
C2 adjective /ɪnhɑːrˈmoʊniəs/

Inharmonious

inharmonieux
Meaning
lacking harmony; discordant in sound; not in tune
Example
The inharmonious sounds from the broken piano made everyone cover their ears.
Les sons inharmonieux du piano cassé ont obligé tout le monde à se couvrir les oreilles.
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.
A2 verb /ɪmˈpruːv/

improve

améliorer
Meaning
to make or become better; to enhance quality or condition
Example
Practice helps improve your skills.
La pratique aide à améliorer vos compétences.
C2 adjective /ɪmˈpælpəbəl/

impalpable

intangible
Meaning
unable to be felt by touch; difficult to grasp or understand
Example
There was an impalpable sense of fear in the room.
Il y avait une sensation intangible de peur dans la pièce.
C2 noun /ɪnˈtɜːrmənt/

interment

inhumation
Meaning
The act of burying a dead body in a grave or tomb.
Example
The interment took place at the family cemetery.
L'inhumation a eu lieu au cimetière familial.
C2 noun /ɪmˈpruː.dəns/

Imprudence

imprudence; négligence; témérité
Meaning
the quality of being imprudent; lack of care for consequences; recklessness
Example
His financial imprudence led to bankruptcy within just two years.
Son imprudence financière a conduit à la faillite en seulement deux ans.
C2 adjective /ɪˈnɪmɪkəl/

inimical

hostile / défavorable
Meaning
tending to obstruct or harm; unfriendly or hostile
Example
The policy was inimical to the country's economic growth.
La politique était défavorable à la croissance économique du pays.
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.
B2 noun /ɪmˈpeɪʃəns/

impatience

impatience
Meaning
The state of being quickly irritated or unable to wait calmly.
Example
His impatience grew as the meeting dragged on.
Son impatience grandissait à mesure que la réunion s'éternisait.
B2 verb /ˈɪl.ə.streɪt/

illustrate

illustrer
Meaning
to explain or make something clear by using examples, pictures, or comparisons
Example
The teacher used diagrams to illustrate the concept.
Le professeur a utilisé des diagrammes pour illustrer le concept.
B2 noun /ˌɪnsɪˈkjʊərɪti/

insecurity

insécurité
Meaning
lack of confidence or assurance; a state of uncertainty or vulnerability
Example
Her insecurity made her doubt her abilities despite her experience.
Son insécurité l'a fait douter de ses capacités.
C2 noun /ɪnˈsɪɡniə/

insignia

insigne
Meaning
A badge or symbol that shows rank, position, or membership.
Example
The soldier proudly wore the insignia of his regiment.
Le soldat portait fièrement l'insigne de son régiment.
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 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.
C2 adjective /ˈɪnfəntaɪl/

infantile

infantile
Meaning
characteristic of an infant; childish
Example
His infantile behavior embarrassed everyone at the meeting.
Son comportement infantile a embarrassé tout le monde à la réunion.
C2 noun /ɪˈreɪdiəns/

irradiance

irradiance
Meaning
the quality of shining brightly; the intensity of light falling on a surface
Example
The irradiance of the sun at noon was overwhelming.
L'irradiance du soleil à midi était accablante.
B2 verb /ˈɪr.ɪ.teɪt/

irritate

irriter
Meaning
To make someone annoyed or angry; to cause discomfort or inflammation.
Example
Rubbing your eyes can irritate them.
Se frotter les yeux peut les irriter.
C2 noun /ˌɪnjuːˈɛndəʊ/

innuendo

sous-entendu
Meaning
An allusive or oblique remark or hint, typically a suggestive or disparaging one.
Example
The manager's innuendo was directed towards his competitor.
L'allusion du directeur était dirigée vers son concurrent.
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 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.
C2 adjective /aɪˈdɒlətrəs/

idolatrous

idolatrique
Meaning
Excessively admiring or worshipping someone or something as an idol.
Example
The king was criticized for his idolatrous devotion to wealth.
Le roi a été critiqué pour sa dévotion idolâtrique à la richesse.
B1 noun /ɪnˈstrʌktər/

instructor

instructeur
Meaning
A person who teaches a subject or skill.
Example
The driving instructor was very patient with new learners.
L'instructeur de conduite était très patient avec les nouveaux élèves.
C2 adjective /ˈɪm.pi.əs/

Impious

impie; blasphématoire
Meaning
irreligious; lacking reverence for religion; blasphemous
Example
The impious act shocked the religious community.
L'acte impie a choqué la communauté religieuse.
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.
C2 verb /ˈɪmprɛɡneɪt/

impregnate

imprégner / rendre enceinte
Meaning
To make pregnant; to fill or saturate with something.
Example
The scientist used a method to impregnate the material with resin.
Le scientifique a utilisé une méthode pour imprégner le matériau de résine.
B2 adjective /ɪnˈædɪkwət/

inadequate

inadéquat
Meaning
Not sufficient or good enough.
Example
The funding was inadequate to complete the project.
Le financement était insuffisant pour terminer le projet.
C1 noun /ɪmˈpɒs.tər/

Impostor

imposteur; fraudeur
Meaning
a person who pretends to be someone else in order to deceive others; a fraud
Example
The impostor convinced everyone he was a doctor until his fake credentials were discovered.
L'imposteur a convaincu tout le monde qu'il était un médecin jusqu'à ce que ses faux diplômes soient découverts.