unacknowledged
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C1 adjective /ˌʌnəkˈnɒlɪdʒd/

unacknowledged

non reconnu
Meaning
Not recognized, admitted, or accepted; ignored or unnoticed
Example
Her contributions to the project went unacknowledged.
Ses contributions au projet sont restées non reconnues.
A2 adjective /ʌnˈhæp.i/

Unhappy

mécontent; triste
Meaning
not happy; feeling sad or displeased; unfortunate or undesirable
Example
He was unhappy with the results of his exam.
Il était mécontent des résultats de son examen.
A2 noun /ˌʌpˈsteəz/

Upstairs

étage supérieur
Meaning
on or to an upper floor of a building; the upper floor or floors
Example
She went upstairs to her bedroom to rest.
Elle est montée à l'étage pour se reposer.
B2 adjective /ʌnfəˈmɪl.jər/

Unfamiliar

inconnu; étrange
Meaning
not known or recognized; strange
Example
The city was unfamiliar to me since I had never been there before.
La ville m'était inconnue car je n'y étais jamais allé avant.
C1 adjective /ʌnˈɒnəd/

unhonoured

déshonoré
Meaning
not respected or given the recognition that is deserved; treated without honor
Example
He felt unhonoured after his years of service were ignored.
Il s’est senti déshonoré lorsque ses années de service ont été ignorées.
C1 noun /ʌnkənˈsɜːrn/

Unconcern

désintérêt
Meaning
lack of worry or interest; indifference
Example
She showed complete unconcern about the criticism.
Elle a montré un total désintérêt face à la critique.
C1 adjective /ʌnˈɡɑː.dɪd/

Unguarded

sans défense, négligent
Meaning
not protected or defended; careless about revealing private thoughts or information
Example
In an unguarded moment, she revealed her true feelings about the project.
Dans un moment sans défense, elle a révélé ses véritables sentiments à propos du projet.
C1 adjective ʌnˈskruːpjʊləs

unscrupulous

démoralisé
Meaning
Having or showing no moral principles; not honest or fair.
Example
Unscrupulous peers can lead adolescents to delinquency.
Les pairs démoralisés peuvent pousser les adolescents à la délinquance.
C1 adjective /ʌnˈbraɪdld/

unbridled

déraisonné
Meaning
Uncontrolled and unrestrained.
Example
The protesters showed unbridled enthusiasm for change.
Les manifestants ont montré un enthousiasme débridé pour le changement.
B1 adjective /ʌnˈjuː.ʒu.əl/

Unusual

inhabituel; étrange;
Meaning
not typical; strange; different from what is normal
Example
She wore an unusual dress to the party.
Elle portait une robe inhabituelle à la fête.
C1 noun /ˌjuːnɪˈfɔːrməti/

Uniformity

uniformité; consistance; égalité
Meaning
the quality of being uniform; consistency or sameness
Example
The uniformity of the design created a pleasing visual effect.
L'uniformité du design a créé un effet visuel attrayant.
A2 conjunction /ʌnˈlɛs/

unless

à moins que
Meaning
except if
Example
We won't go unless it stops raining.
Nous n'irons pas à moins qu'il ne cesse de pleuvoir.
C1 adjective /ˌʌnbɪˈliːvɪŋ/

unbelieving

incrédule
Meaning
Not willing or able to believe; skeptical or doubtful
Example
She gave him an unbelieving look when he claimed to have met a celebrity.
Elle lui a lancé un regard incrédule lorsqu'il a affirmé avoir rencontré une célébrité.
B1 noun /ˈjuːs.fəl.nəs/

Usefulness

utilité
Meaning
the quality of being useful; practical value or helpfulness
Example
The usefulness of this tool became apparent during the project.
L'utilité de cet outil est devenue évidente pendant le projet.
A2 verb /ʌpˈdeɪt/

update

mettre à jour
Meaning
to make something more modern or current; to provide new information
Example
Please update your software regularly.
Veuillez mettre à jour votre logiciel régulièrement.
C1 noun /ˈjuːnɪsən/

unison

à l'unisson
Meaning
Simultaneous performance or utterance of action or speech.
Example
The choir sang in unison.
Le chœur a chanté à l'unisson.
C2 noun /ˈʌmbrɪdʒ/

umbrage

mécontentement, offense
Meaning
A feeling of resentment or offense.
Example
She took umbrage at his rude remark.
Elle s'est vexée par sa remarque grossière.
C1 adjective /ˌʌnsəˈfɪstɪˌkeɪtɪd/

unsophisticated

non sophistiqué
Meaning
Lacking worldly experience, refinement, or complexity.
Example
The villagers led an unsophisticated but happy life.
Les villageois menaient une vie non sophistiquée mais heureuse.
B1 adjective /ˈʌpər/

upper

supérieur
Meaning
higher in position or rank
Example
The upper floor of the building is under renovation.
Le étage supérieur du bâtiment est en rénovation.
A2 noun /ˈʌndərweər/

underwear

sous-vêtements
Meaning
Clothing worn beneath outer clothes, typically next to the skin.
Example
He bought new underwear for the trip.
Il a acheté de nouveaux sous-vêtements pour le voyage.
C2 adjective /ʌnˈkɒnʃənəbl/

unconscionable

injustifiable
Meaning
shockingly unfair or unreasonable
Example
The company made unconscionable profits from the crisis.
L'entreprise a réalisé des bénéfices injustifiables pendant la crise.
C1 adjective /ʌnˈfɛtərd/

unfettered

libéré
Meaning
not restricted or confined; free
Example
The artist enjoyed unfettered freedom of expression.
L'artiste a apprécié la liberté illimitée d'expression.
B2 adjective /ˌʌndɪˈveləpt/

Undeveloped

non développé; immature; primitif
Meaning
not yet developed; immature or primitive
Example
The undeveloped land was later turned into a park.
Le terrain non développé a été ensuite transformé en un parc.
B2 verb /ʌpˈhoʊld/

uphold

maintenir
Meaning
to maintain or support a principle, law, or decision
Example
The judge promised to uphold justice at all costs.
Le juge a promis de maintenir la justice à tout prix.
B1 noun /ʌnˈhæp.i.nəs/

unhappiness

malheur
Meaning
the state of being unhappy; sadness or dissatisfaction
Example
Her constant unhappiness affected everyone around her.
Son malheur constant affectait tous ceux qui l'entouraient.
B2 adjective /ʌnˌkənˈdɪʃ.ən.əl/

Unconditional

inconditionnel
Meaning
not subject to any conditions; complete and absolute
Example
She offered her unconditional support to her friend in need.
Elle a offert son soutien inconditionnel à son ami dans le besoin.
C2 adjective /ˌʌnrɪˈmɪtɪŋ/

unremitting

ininterrompu
Meaning
Never relaxing or stopping; persistent.
Example
Her unremitting efforts finally paid off.
Ses efforts ininterrompus ont finalement porté leurs fruits.
B1 adjective /ʌnˈedjʊkeɪtɪd/

Uneducated

analphabète; non éduqué
Meaning
lacking education; not having received formal schooling or training
Example
Many uneducated workers struggle to find well-paying jobs.
Beaucoup de travailleurs analphabètes ont du mal à trouver des emplois bien rémunérés.
C1 adjective /ʌlˈtɪəriər/

ulterior

motif caché
Meaning
hidden or secret, often with a selfish motive
Example
He invited her with an ulterior motive.
Il l'a invitée avec un motif caché.
B2 adjective /ˌʌnprɪˈdɪktəbəl/

unpredictable

imprévisible
Meaning
not able to be predicted; changing suddenly and unexpectedly
Example
The weather in this region is highly unpredictable.
Le climat de cette région est très imprévisible.
C1 adjective /ˌʌndərˈsaɪzd/

undersized

sous-dimensionné
Meaning
Smaller than the usual or expected size.
Example
The undersized puppy struggled to keep up with its siblings.
Le chiot sous-dimensionné avait du mal à suivre ses frères et sœurs.
C1 adjective /ʌnˈʃeɪkən/

Unshaken

inquétable; ferme
Meaning
not disturbed or affected; firm and steady; unwavering
Example
Her faith remained unshaken despite all the challenges.
Sa foi est restée inébranlable malgré tous les défis.
C1 noun /ˌʌnbɪˈliːf/

Unbelief

incrédulité
Meaning
lack of religious belief; skepticism or doubt
Example
His unbelief in the supernatural made him a skeptic.
Son incrédulité face au surnaturel l'a transformé en un sceptique.
C2 adjective /ʌnˈtræməld/

untrammeled

liberté illimitée
Meaning
Not restricted or hampered; free and unrestricted.
Example
She enjoyed untrammeled freedom in her new life abroad.
Elle a apprécié la liberté illimitée dans sa nouvelle vie à l'étranger.
C1 noun /ʌpˈhiːvəl/

upheaval

bouleversement
Meaning
a violent or sudden change or disruption to something
Example
The company faced a major upheaval after the sudden resignation of its CEO.
L'entreprise a connu un grand bouleversement après la démission soudaine de son PDG.
C1 adjective /juːˈbɪkwɪtəs/

ubiquitous

omniprésent
Meaning
Existing or being everywhere at the same time.
Example
Social media has become ubiquitous among young people.
Les médias sociaux sont devenus omniprésents parmi les jeunes.
B2 adjective /ˌʌnrɪˈzɒlvd/

unresolved

non résolu
Meaning
not solved or settled; remaining undecided or unclear
Example
The dispute remains unresolved despite several meetings.
Le conflit reste non résolu malgré plusieurs réunions.
B2 adjective /ˈjuː.nɪ.faɪd/

unified

unifié
Meaning
Made into a whole or joined together.
Example
A unified approach fosters better outcomes.
Une approche unifiée favorise de meilleurs résultats.
C2 adjective /ˈʌndjʊləs/

undulous

ondulé
Meaning
Having a wavy surface or form.
Example
The artist painted the undulous sea at sunset.
L'artiste a peint la mer ondulée au coucher du soleil.
C1 adjective ʌnˈmætʃt

unmatched

incomparable
Meaning
Not equaled or rivaled by any other; without equal.
Example
The freedom fighters showed unmatched bravery.
Les combattants de la liberté ont montré un courage incomparable.
C2 verb /ʌnˈkaʊtʃ/

uncouch

retirer du canapé (usage rare)
Meaning
to remove from a couch or to release from being laid down (rare/archaic usage)
Example
The surgeon attempted to uncouch the cataract.
Le chirurgien a tenté d'enlever la cataracte.
C2 noun /ɜːrˈbænɪti/

urbanity

urbanité
Meaning
refined courtesy, elegance, and sophistication in manner
Example
Her urbanity made her popular among diplomats and leaders.
Son urbanité la rendait populaire parmi les diplomates et les dirigeants.
C2 adjective /ˌʌnprəˈpɪʃəs/

unpropitious

défavorable
Meaning
Not giving or indicating a good chance of success; unfavorable.
Example
The team began their journey under unpropitious weather conditions.
L'équipe a commencé son voyage sous des conditions météorologiques défavorables.
C2 verb /ʌpˈhiːv/

upheave

soulever
Meaning
to lift or raise something forcefully; to cause to rise suddenly
Example
The workers had to upheave the heavy stone to clear the path.
Les travailleurs ont dû soulever la grosse pierre pour dégager le chemin.
B2 noun /ˌʌnəˌveɪləˈbɪləti/

unavailability

indisponibilité
Meaning
The state of being not available or not accessible.
Example
The unavailability of the manager caused a delay in the project.
L'indisponibilité du gestionnaire a causé un retard dans le projet.
A1 noun /ˈʌŋkəl/

uncle

oncle
Meaning
the brother of one's father or mother
Example
My uncle is visiting us next week.
Mon oncle nous rendra visite la semaine prochaine.
C1 adjective /ʌnˈkwaɪ.ət/

Unquiet

agité; anxieux; perturbé
Meaning
restless; unable to remain still or quiet; anxious or troubled
Example
She spent an unquiet night worrying about the exam results.
Elle a passé une nuit agitée à s'inquiéter des résultats de l'examen.
B2 adjective /ˌʌnkənˈvɛnʃənl/

unconventional

non conventionnel
Meaning
not based on or conforming to what is generally done or believed
Example
Her unconventional approach to teaching inspired her students to think creatively.
Son approche pédagogique non conventionnelle a inspiré ses élèves à penser de manière créative.
C1 adjective /ʌnˈtʃælɪndʒd/

Unchallenged

incontesté; accepté sans opposition; sans rival
Meaning
not disputed or questioned; accepted without opposition; having no rival
Example
He remained the unchallenged champion for five years.
Il est resté le champion incontesté pendant cinq ans.
C1 adjective /ʌnˈkleɪmd/

Unclaimed

non réclamé; non demandé; abandonné ou sans propriétaire
Meaning
not claimed by anyone; not demanded or requested; abandoned or ownerless
Example
The unclaimed luggage was stored in the airport's lost property department.
Les bagages non réclamés ont été stockés dans le département des objets trouvés de l'aéroport.
B2 adjective /ˈʌl.tɪ.mət/

Ultimate

final; suprême; ultime
Meaning
being the best or most extreme example of its kind; final; last
Example
This is the ultimate test of your skills.
C'est le test ultime de vos compétences.
A2 verb /ʌpˈset/

upset

contrarier
Meaning
to make someone worried, sad, or angry; to disturb
Example
The bad news upset everyone.
Les mauvaises nouvelles ont upset tout le monde.
C2 noun /ˈʌp.wel.ɪŋ/

upwelling

Un phénomène océanographique impliquant le mouvement de l'eau dense, froide et riche en nutriments vers la surface de l'océan.
Meaning
An oceanographic phenomenon that involves wind-driven motion of dense, cooler, and nutrient-rich water towards the ocean surface.
Example
Upwelling brings nutrients to the ocean surface.
L'upwelling apporte des nutriments à la surface de l'océan.
C1 adjective /ˌʌnˈɪntɪmeɪtɪŋ/

unintimating

sans indices
Meaning
Not giving a hint or suggestion; not indicating.
Example
His unintimating tone gave no clue of his true feelings.
Son ton sans indices n'a donné aucun indice de ses véritables sentiments.
B2 adjective /ˌʌndərˈlaɪɪŋ/

underlying

sous-jacent
Meaning
basic or hidden but important; forming the foundation of something
Example
The underlying reason for the conflict was never addressed.
La raison sous-jacente du conflit n'a jamais été abordée.
C2 noun /ˈʌŋkʃən/

unction

unction
Meaning
The act of anointing as part of a religious or ceremonial ritual; excessive or insincere flattery.
Example
The priest performed the holy unction with solemnity.
Le prêtre a accompli l'unction sacrée avec solennité.
B1 adjective /ʌnˈlaɪkli/

Unlikely

improbable; peu probable
Meaning
not likely to happen; improbable
Example
It's unlikely to rain today with such clear skies.
Il est peu probable qu'il pleuve aujourd'hui avec un ciel aussi dégagé.
A2 adjective /ʌnˈlʌki/

Unlucky

malchanceux; de mauvaise chance
Meaning
having bad luck; unfortunate
Example
He was unlucky to miss the winning shot.
Il était malchanceux de manquer le tir gagnant.
B1 adjective /ˌʌnˈɪntrəstɪŋ/

uninteresting

ennuyeux
Meaning
not holding attention or curiosity; boring
Example
The lecture was uninteresting and difficult to stay focused on.
La conférence était ennuyeuse et difficile à suivre.
B2 noun /juːˈtɪl.ə.ti/

Utility

utilité; bénéfice; service public
Meaning
the state of being useful, profitable, or beneficial; a public service
Example
The utility of solar panels increases with rising electricity costs.
L'utilité des panneaux solaires augmente avec la hausse des coûts de l'électricité.
A2 adjective /ʌnˈtaɪdi/

Untidy

désordonné; en désordre;
Meaning
not neat or orderly; messy and disorganized
Example
Her untidy room was filled with clothes scattered everywhere.
Sa chambre en désordre était remplie de vêtements éparpillés partout.
C2 verb /ʌnˈfrɒk/

unfrock

dévêtir un prêtre de sa position
Meaning
To remove a priest from his position or deprive someone of a rank.
Example
The corrupt priest was unfrocked after the investigation.
Le prêtre corrompu a été défroqué après l'enquête.
C1 adjective /ʌnˈtɛnəbl/

untenable

intenable
Meaning
not able to be maintained or defended against attack or objection
Example
The politician resigned when his position became untenable.
Le politicien a démissionné lorsque sa position est devenue intenable.
C1 adjective /ˌʌnfɔːrˈsiːn/

unforeseen

Meaning
Not anticipated or predicted; unexpected.
Example
The project faced unforeseen challenges that delayed its completion.
B2 verb ˈjuːnɪfaɪ

unify

unifier
Meaning
To make or become united, uniform, or whole; to bring together into a single unit.
Example
Adolescents unify with peers for social acceptance.
Les adolescents s'unifient avec leurs pairs pour l'acceptation sociale.
B2 adjective /ʌnˈθɪŋkəbl/

Unthinkable

impensable
Meaning
impossible to conceive or imagine; beyond belief or consideration
Example
It was unthinkable that such a tragedy could happen in our peaceful town.
Il était impensable qu'une telle tragédie puisse se produire dans notre ville paisible.
B2 adjective /ʌnˈhɜːrt/

unhurt

indemne
Meaning
Not injured or harmed.
Example
She walked away from the accident unhurt.
Elle est sortie indemne de l'accident.
C1 adjective /ʌnˈsɪvəlaɪzd/

Uncivilized

non civilisé; sauvage;
Meaning
not developed in terms of civilization; lacking social organization and culture; barbarous
Example
The explorers encountered an uncivilized tribe deep in the Amazon rainforest.
Les explorateurs ont rencontré une tribu non civilisée au cœur de la forêt amazonienne.
C1 adjective /ʌnˈfɔːltərɪŋ/

unfaltering

inébranlable
Meaning
Steady and resolute; not weakening or hesitating
Example
She continued with unfaltering determination.
Elle a continué avec une détermination inébranlable.
B2 adjective /ˌʌndɪˈstɜːrbd/

Undisturbed

ininterrompu
Meaning
not interrupted or interfered with; calm and peaceful
Example
She slept undisturbed for eight hours.
Elle a dormi huit heures sans être dérangée.
A2 noun /ˈjuːzər/

user

utilisateur
Meaning
a person who uses or operates something
Example
He is a frequent user of this app.
Il est un utilisateur fréquent de cette application.
A1 verb /ˌʌndərˈstænd/

understand

comprendre
Meaning
to know the meaning of something; to comprehend
Example
Do you understand the instructions?
Comprenez-vous les instructions ?
B1 adjective /ʌnˈjuzd/

Unused

non utilisé; inutilisé
Meaning
not being used; not having been used before
Example
There are many unused rooms in this old mansion.
Il y a beaucoup de pièces inutilisées dans ce vieux manoir.
B2 adjective /ʌnˈendɪŋ/

Unending

sans fin
Meaning
continuing forever; without end
Example
The unending rain made the day feel gloomy.
La pluie sans fin a rendu la journée morose.
B2 adjective /ˌʌndɪˈsaɪdɪd/

Undecided

indécis; incertain
Meaning
not having made a decision; uncertain
Example
She was undecided about which college to attend.
Elle était indécise sur quel collège fréquenter.
B2 adjective /ʌnˈraɪp/

Unripe

immature
Meaning
not fully developed or matured; not ready to be eaten
Example
The unripe bananas will turn yellow in a few days.
Les bananes non mûres deviendront jaunes dans quelques jours.
C1 adjective /ˌʌnfɔːrθˈkʌmɪŋ/

unforthcoming

réticent
Meaning
Not willing to talk or provide information; uncooperative.
Example
The witness was unforthcoming about what he had seen.
Le témoin était réticent à propos de ce qu'il avait vu.
B2 adjective /ʌnˈbaɪəst/

unbiased

impartiale
Meaning
Not showing prejudice; impartial and fair.
Example
The report gave an unbiased view of the situation.
Le rapport a donné un point de vue impartial de la situation.
B1 adjective /ʌnˈklɪər/

unclear

peu clair
Meaning
not easy to understand; vague or ambiguous
Example
The instructions were unclear, so I asked for clarification.
Les instructions étaient peu claires, alors j'ai demandé des clarifications.
B2 adjective /ˌʌnəˈveɪləbəl/

unavailable

indisponible
Meaning
Not able to be obtained, reached, or used; not present or accessible.
Example
The manager was unavailable to take calls during the meeting.
Le directeur n'était pas disponible pour répondre aux appels pendant la réunion.
C1 noun ˌʌndərˈprɪvəlɪdʒd ɡruːps

underprivileged groups

groupes défavorisés
Meaning
Groups of people who lack basic necessities or advantages that are available to other members of society.
Example
Underprivileged groups benefit from social initiatives.
Les groupes défavorisés bénéficient des initiatives sociales.
B2 adjective /ʌnˈrɪəl/

unreal

irréel
Meaning
not real or not based on reality; exaggerated or imaginary
Example
The experience felt unreal after the sudden news.
L’expérience semblait irréelle après la nouvelle soudaine.
C2 adjective /ˌʌnsɛrəˈmoʊniəs/

unceremonious

sans cérémonie/rude
Meaning
Done without formality or courtesy; abrupt or rude.
Example
He made an unceremonious exit from the party.
Il a fait une sortie sans cérémonie de la fête.
B2 adjective /ʌnˈsuːtəbl/

Unsuitable

inapproprié; inapte
Meaning
not fitting or appropriate for a particular purpose or situation
Example
This formal dress is unsuitable for a casual beach party.
Cette robe formelle est inappropriée pour une fête de plage décontractée.
B2 adjective /ʌnˈkɒmən/

uncommon

inhabituel
Meaning
rare, unusual, or remarkable
Example
It is uncommon to see snow in this region.
Il est rare de voir de la neige dans cette région.
C1 adjective /ʌnˈsɪvəl/

Uncivil

incivil; impoli;
Meaning
not polite or courteous; rude and discourteous in behavior
Example
His uncivil remarks during the meeting offended everyone present.
Ses remarques inciviles lors de la réunion ont offensé tout le monde présent.
C1 noun /ˈʌndərˌteɪkər/

undertaker

employé des pompes funèbres
Meaning
A person whose job is to prepare the dead for burial and arrange funerals.
Example
The undertaker prepared the body for the funeral service.
L'employé des pompes funèbres a préparé le corps pour le service funéraire.
B1 noun /ˈjuːnjən/

Union

union
Meaning
the action of joining or combining; a political unit formed from separate states
Example
The union of the two companies created a powerful corporation.
L'union des deux entreprises a créé une puissante société.
C1 noun /ˈʌp.tɜːn/

upturn

amélioration
Meaning
An improvement or upward trend in a situation, especially in business or economy.
Example
The company experienced an upturn in sales last quarter.
L'entreprise a connu une amélioration des ventes le dernier trimestre.
B2 adjective /ˌʌn.kəʊˈɒp.ər.ə.tɪv/

uncooperative

non coopératif
Meaning
not willing to help or work with others; unhelpful
Example
The witness was uncooperative and refused to answer questions.
Le témoin était non coopératif et a refusé de répondre aux questions.
C1 adjective /ˌʌnɪnˈhɪbɪtɪd/

uninhibited

désinhibé
Meaning
Not restrained or restricted; free in behavior or expression.
Example
She gave an uninhibited laugh at the joke.
Elle a éclaté d'un rire désinhibé à la blague.
B2 adjective /ʌnˈprɒf.ɪ.tə.bl̩/

Unprofitable

non rentable
Meaning
not yielding profit or gain; not producing financial benefit
Example
The unprofitable business was forced to close down after three years.
L'entreprise non rentable a été forcée de fermer après trois ans.
B2 adjective /ˌʌnˈnoʊ.tɪst/

Unnoticed

inaperçu; ignoré
Meaning
not seen or observed; ignored
Example
His hard work went unnoticed by his manager.
Son travail acharné est passé inaperçu par son manager.
B2 adverb /ʌnˈnesəserəli/

Unnecessarily

inutillement
Meaning
to a greater extent than is needed; without necessity
Example
Don't worry unnecessarily about the exam.
Ne t'inquiète pas inutilement pour l'examen.
B2 adjective /ʌnˌkənˈfɜːmd/

Unconfirmed

non confirmé; non vérifié;
Meaning
not confirmed as true or definite; not verified or substantiated
Example
The report remains unconfirmed until we receive official verification.
Le rapport reste non confirmé jusqu'à ce que nous recevions la vérification officielle.
C1 adjective /ʌnˈduː/

Undue

excessif; inapproprié; plus que ce qui est nécessaire ou approprié
Meaning
excessive; inappropriate; more than is necessary or proper
Example
The teacher complained about undue pressure from parents.
Le professeur s'est plaint de la pression excessive des parents.
C1 verb /ˌʌndəˈreɪt/

underrate

sous-estimer
Meaning
to fail to recognize the full value or importance of something or someone
Example
Many people underrate the benefits of regular exercise.
Beaucoup de gens sous-estiment les bienfaits de l'exercice régulier.
B2 adjective /ʌnˈsiːn/

Unseen

invisible; non vu ou remarqué auparavant
Meaning
not previously seen or noticed; invisible; hidden
Example
The unseen forces of nature can be very powerful.
Les forces invisibles de la nature peuvent être très puissantes.
C1 adjective ʌnˈjiːl.dɪŋ

unyielding

inébranlable ou ferme
Meaning
Not easily broken or giving in to pressure.
Example
Her unyielding determination helped her overcome all challenges.
Sa détermination inébranlable l'a aidée à surmonter tous les défis.
C1 adjective /ʌnˈkæni/

uncanny

étrange
Meaning
Strange or mysterious, especially in an unsettling way.
Example
She has an uncanny ability to predict the future.
Elle a une étrange capacité à prédire l'avenir.
B2 noun /ʌnəˈbɪləti/

unability

incapacité
Meaning
the state of being unable to do something; incapacity
Example
His unability to solve the problem caused delays in the project.
Son incapacité à résoudre le problème a causé des retards dans le projet.
C2 verb /juˈzɜrp/

usurp

usurper
Meaning
to take someone's position of power illegally or by force
Example
The general tried to usurp the king's throne.
Le général a tenté de usurper le trône du roi.
B1 adjective /ʌnˈeɪ.bəl/

Unable

incapable
Meaning
lacking the power, skill, or means to do something
Example
He was unable to attend the meeting.
Il était incapable d'assister à la réunion.
C1 noun /ʌnˈfeɪθfʊlnəs/

unfaithfulness

infidélité
Meaning
the quality of being disloyal or not faithful; breach of trust or fidelity
Example
His unfaithfulness led to the end of their marriage.
Son infidélité a conduit à la fin de leur mariage.
C1 adjective /ˌjuːnɪˈsɛljʊlər/

unicellular

unicellulaire
Meaning
Consisting of a single cell.
Example
Amoebas are unicellular organisms.
Les amibes sont des organismes unicellulaires.
B2 noun /ʌnˈkɒnʃəsnəs/

unconsciousness

inconscience
Meaning
the state of being unaware of and unable to respond to one's surroundings
Example
After the accident, he was in a state of unconsciousness for several hours.
Après l'accident, il était dans un état d'inconscience pendant plusieurs heures.
B2 adjective /ʌnˈbæləns/

Unbalanced

déséquilibré; instable
Meaning
not balanced; lacking stability or equilibrium; mentally unstable
Example
The unbalanced table kept wobbling.
La table déséquilibrée continua à osciller.
B1 adjective /ʌnˈsɜːrtən/

Uncertain

incertain
Meaning
not able to be relied on; not known or definite; not having reliable knowledge
Example
I am uncertain about my future career plans.
Je suis incertain de mes plans de carrière futurs.
B2 adjective /ˈʌpˌhɪl/

Uphill

difficile; nécessitant un grand effort; en pente ascendante
Meaning
difficult; requiring great effort; sloping upward
Example
Learning a new language can be an uphill battle.
Apprendre une nouvelle langue peut être une bataille difficile.
B2 adjective /ˈʌpˌraɪt/

Upright

honnête et moralement correct; vertical ou dressé en position
Meaning
honest and morally correct; vertical or erect in position
Example
She is known for being an upright and honest businesswoman.
Elle est connue pour être une femme d'affaires honnête et droite.
C1 adjective /ˌʌnkɒnstɪˈtuːʃənəl/

Unconstitutional

inconstitutionnel
Meaning
not in accordance with a political constitution; violating constitutional principles
Example
The court declared the new law unconstitutional.
Le tribunal a déclaré que la nouvelle loi était inconstitutionnelle.
B2 adjective /ʌnˈskɪld/

Unskilled

non qualifié; travailleur sans compétences
Meaning
lacking technical training or ability; not requiring special skills
Example
Many unskilled workers are looking for training opportunities.
De nombreux travailleurs non qualifiés recherchent des opportunités de formation.
B2 adjective /ʌnˈhɜːd/

Unheard

inouï; inconnu
Meaning
not heard or listened to; not given a hearing; unknown or unfamiliar
Example
His complaints went unheard by the management.
Ses plaintes sont passées inaperçues par la direction.
C1 verb /ʌnˈmɑːsk/

unmask

démasquer
Meaning
to remove a mask or covering; to reveal the true identity, nature, or intentions of someone or something
Example
The investigation helped unmask the real culprit behind the crime.
L’enquête a permis de démasquer le vrai coupable du crime.
B2 adjective /ʌnˈlɔːfl/

Unlawful

illégal; illicite
Meaning
not authorized by law; illegal
Example
The court declared the search unlawful.
Le tribunal a déclaré que la perquisition était illégale.
B1 adjective /ʌnˈtru/

Untrue

faux; incorrect
Meaning
not true; false; incorrect
Example
His statement about the incident was completely untrue.
Sa déclaration sur l'incident était complètement fausse.
C1 adjective /ˌʌnˈpɑr.də.nə.bəl/

Unpardonable

impardonnable
Meaning
too bad to be forgiven; inexcusable
Example
His betrayal of trust was an unpardonable offense.
Sa trahison était un délit impardonnable.
B2 noun /ˈjuː.sɪdʒ/

Usage

utilisation
Meaning
the action of using something; the way in which words are used in a language
Example
The dictionary explains the correct usage of difficult words.
Le dictionnaire explique l'utilisation correcte des mots difficiles.
C1 noun /ˈʌp.rɔːr/

Uproar

tumulte; agitation; bruit
Meaning
a loud and emotional noise or disturbance; public outcry
Example
The announcement caused an uproar among the students.
L'annonce a provoqué un tumulte parmi les étudiants.
B2 adjective /ˈʌt.moʊst/

Utmost

extrême; maximum
Meaning
greatest; most extreme; maximum possible
Example
She showed utmost care while handling the fragile items.
Elle a montré un soin extrême en manipulant les objets fragiles.
B2 verb /ˌʌndərˈɛstɪmeɪt/

underestimate

sous-estimer
Meaning
To judge something as less important or smaller than it really is.
Example
Never underestimate the power of teamwork.
Ne sous-estimez jamais la puissance du travail d'équipe.