underlie
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C1 verb /ˌʌndərˈlaɪ/

underlie

sous-tendre
Meaning
to be the hidden cause or basis of something
Example
Strong cultural traditions underlie the community's practices.
De fortes traditions culturelles sous-tendent les pratiques de la communauté.
C1 adjective /ˌjuːnɪˈsɛljʊlər/

unicellular

unicellulaire
Meaning
Consisting of a single cell.
Example
Amoebas are unicellular organisms.
Les amibes sont des organismes unicellulaires.
C1 verb /ˌʌndərˈsteɪt/

understate

minimiser
Meaning
To describe something as being less important or serious than it really is.
Example
He tends to understate his achievements.
Il a tendance à minimiser ses réalisations.
B1 verb /ʌnˈræp/

unwrap

déballer
Meaning
remove wrapping or covering from something; reveal something gradually or clearly
Example
She carefully unwrapped the gift with excitement.
Elle a déballé le cadeau avec précaution et excitation.
B2 noun ˌɜːbənaɪˈzeɪʃən

urbanization

urbanisation
Meaning
The process by which towns and cities are formed and become larger as more people begin living and working in central areas.
Example
Urbanization leads to more developed infrastructure.
L'urbanisation mène à une infrastructure plus développée.
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.
B1 adjective /ˌʌnbɪˈliːvəbəl/

Unbelievable

incroyable
Meaning
impossible to believe; extremely surprising or remarkable
Example
The magician's performance was absolutely unbelievable.
La performance du magicien était absolument incroyable.
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 verb /ˈjuːtɪlaɪz/

utilize

utiliser
Meaning
to make practical or effective use of something
Example
The company aims to utilize solar energy for production.
L'entreprise vise à utiliser l'énergie solaire pour la production.
B2 adjective /ʌn.rɪˈleɪ.tɪd/

Unrelated

sans rapport; non lié
Meaning
having no connection or relationship; not connected by family ties
Example
The two incidents were completely unrelated to each other.
Les deux incidents étaient complètement sans rapport entre eux.
C1 adjective /ʌnˈtaɪərɪŋ/

Untiring

inlassable; persévérant; infatigable
Meaning
continuing without stopping; persistent; tireless
Example
Her untiring efforts finally led to success.
Ses efforts inlassables ont finalement conduit au succès.
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.
C1 adjective /ˌʌndərˈhændɪd/

underhanded

sournois
Meaning
acting or done in a dishonest or secret way
Example
They exposed the company's underhanded dealings with its suppliers.
Ils ont exposé les pratiques sournoises de l'entreprise avec ses fournisseurs.
C2 adjective /ʌnˈwəʊntɪd/

unwonted

inhabituel
Meaning
Unusual, uncommon, or out of the ordinary.
Example
She spoke with an unwonted gentleness that surprised everyone.
Elle parla avec une douceur inhabituelle qui surprit tout le monde.
B2 verb /ʌnˈkʌvə(r)/

uncover

découvrir
Meaning
to reveal something that was hidden or secret
Example
The investigation uncovered new evidence.
L'enquête a découvert de nouvelles preuves.
B2 adjective /ˌʌnkənˈvɪnsɪŋ/

Unconvincing

invraisemblable
Meaning
failing to persuade or impress; not believable or credible
Example
His excuse for being late was completely unconvincing.
Son excuse pour être en retard était complètement invraisemblable.
B2 adjective /ʌnˈkɒn.ʃəs/

Unconscious

inconscient; évanoui
Meaning
not awake and aware of one's surroundings; done or existing without one realizing
Example
The patient was unconscious for several hours after the surgery.
Le patient était inconscient pendant plusieurs heures après l'opération.
C1 adjective /ʌnˈkuːθ/

uncouth

grossier
Meaning
Lacking good manners, refinement, or grace; awkward or rough.
Example
His uncouth behavior shocked the guests at the party.
Son comportement grossier a choqué les invités à la fête.
C2 adjective /ˌʌnɪkˈsɛpʃənəbl/

unexceptionable

irréprochable
Meaning
Not open to objection; acceptable and unobjectionable
Example
His behavior was unexceptionable throughout the event.
Son comportement était irréprochable tout au long de l'événement.
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.
C2 adverb /ʌnˈɜːrɪŋli/

unerringly

sans erreur
Meaning
Without making any mistakes; always accurate
Example
The archer aimed unerringly at the target.
L'archer a visé sans erreur la cible.
B2 adverb /ˈʌt.ə.li/

Utterly

totalement; absolument; complètement
Meaning
completely; absolutely; totally
Example
The movie was utterly boring and I fell asleep.
Le film était complètement ennuyeux et je me suis endormi.
A2 noun /ˈʌndərwɛr/

Under wear

sous-vêtements
Meaning
clothing worn under other clothes, next to the skin
Example
She bought new underwear from the department store.
Elle a acheté de nouveaux sous-vêtements au magasin.
C2 noun /ˈɜːrtʃɪn/

urchin

gamin des rues
Meaning
a mischievous or poorly dressed child, often from the streets
Example
The ragged urchins played by the riverbank.
Les gamins en haillons jouaient au bord de la rivière.
B1 preposition, adverb, adjective /ˌʌndərˈniːθ/

underneath

sous, en dessous
Meaning
Located directly below or beneath something
Example
The keys were hidden underneath the pile of papers.
Les clés étaient cachées sous la pile de papiers.
C2 noun /juːˌtɪlɪˈtɛəriənɪzəm/

utilitarianism

utilitarisme
Meaning
The ethical theory that actions are right if they are useful or for the benefit of the majority.
Example
Utilitarianism suggests that we should act to maximize overall happiness.
L'utilitarisme suggère que nous devrions agir pour maximiser le bonheur global.
B2 verb /ˌʌndərˈɡoʊ/

undergo

subir
Meaning
to go through something, especially something unpleasant or difficult
Example
She had to undergo surgery to recover.
Elle a dû subir une chirurgie pour se rétablir.
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.
C2 adjective /ʌnˈmɪtɪɡeɪtɪd/

unmitigated

complet
Meaning
absolute; not lessened or moderated
Example
The meeting was an unmitigated disaster.
La réunion était un désastre complet.
B1 adjective /ʌnˈfɔːr.tʃən.ət/

Unfortunate

malheureux; regrettable
Meaning
having bad luck; regrettable or unlucky
Example
It was unfortunate that the meeting was cancelled at the last minute.
C'était malheureux que la réunion ait été annulée à la dernière minute.
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.
C2 adjective /juːˈnɪsənənt/

unisonant

harmonieux
Meaning
Sounding together or in harmony.
Example
The unisonant voices created a powerful effect.
Les voix harmonieuses ont créé un effet puissant.
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.
C1 adjective /ˈʌpərˌmoʊst/

uppermost

le plus élevé
Meaning
situated at the highest place or most important
Example
Her family's safety was uppermost in her mind during the crisis.
La sécurité de sa famille était la priorité dans son esprit pendant la crise.
B2 adjective /ˌʌnɪˈmædʒənəbəl/

Unimaginable

inimaginable
Meaning
impossible to conceive; beyond imagination
Example
The scale of destruction was unimaginable until we saw it firsthand.
L'échelle de la destruction était inimaginable jusqu'à ce que nous le voyions de nos propres yeux.
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.
C2 adjective /ʌnˈlɛtəd/

unlettered

analphabète
Meaning
lacking education or the ability to read and write; illiterate
Example
The unlettered villagers relied on oral traditions to preserve their history.
Les villageois analphabètes dépendaient des traditions orales pour préserver leur histoire.
A2 adjective /ˈjuːʒəl/

usual

habituel
Meaning
habitually or typically occurring or done
Example
It’s our usual meeting spot.
C'est notre lieu de réunion habituel.
B2 noun ˌjuːtɪlaɪˈzeɪʃən

utilization

utilisation
Meaning
The action of making practical and effective use of something.
Example
Increased plastic utilization calls for better waste management.
L'augmentation de l'utilisation du plastique nécessite une meilleure gestion des déchets.
C2 verb /ʌnˈkloʊð/

unclothe

déshabiller; enlever les vêtements
Meaning
to remove clothing from someone or something
Example
The nurse helped unclothe the patient for the examination.
L'infirmière a aidé à déshabiller le patient pour l'examen.
C2 adjective /ˌʌn.təˈwɔːrd/

untoward

inattendu
Meaning
Unexpected and inappropriate or inconvenient.
Example
The meeting ended without any untoward incidents.
La réunion s'est terminée sans incidents inattendus.
C1 adjective /ʌnˈsiːmli/

unseemly

indécent
Meaning
Not proper or appropriate in behavior or appearance; unbecoming.
Example
His unseemly remarks embarrassed everyone at the dinner table.
Ses remarques indécentes ont embarrassé tout le monde à la table du dîner.
B2 adjective ʌnˈprɛsɪˌdɛntɪd

unprecedented

sans précédent
Meaning
Never done or known before; without previous example.
Example
Unprecedented advancements in science changed human lives.
Les avancées sans précédent en science ont changé la vie humaine.
C2 noun/verb /ˈʌpˌkæst/

upcast

lancer vers le haut
Meaning
Verb: To cast or throw upward. Noun: Something thrown or directed upward.
Example
The fisherman upcast his net into the air.
Le pêcheur a lancé son filet dans les airs.
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 /ˌʌnəbˈtruːsɪv/

unobtrusive

discret
Meaning
not attracting attention; blending in without causing notice
Example
The security cameras are designed to be unobtrusive.
Les caméras de sécurité sont conçues pour être discrètes.
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 /ʌnˈsteɪbəl/

Unstable

instable
Meaning
likely to change; not steady or secure; unsteady
Example
The unstable economy made people worried about their jobs.
L'économie instable a rendu les gens inquiets au sujet de leurs emplois.
C1 adjective /ʌnˈmænɪdʒəbəl/

Unmanageable

ingérable; hors de contrôle
Meaning
difficult or impossible to control or handle
Example
The large class became unmanageable without proper supervision.
La grande classe est devenue ingérable sans une supervision adéquate.
A2 noun /ˈjuːnɪt/

unit

unité
Meaning
an individual thing or person regarded as a single and complete entity
Example
Each unit in the production line is carefully tested.
Chaque unité de la ligne de production est soigneusement testée.
B2 adjective /ˌʌndɪˈzaɪərəbl/

Undesirable

indésirable; nuisible; désagréable
Meaning
not wanted or wished for; harmful or unpleasant
Example
The new policy had several undesirable consequences.
La nouvelle politique a eu plusieurs conséquences indésirables.
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.
C2 noun /ˌjuːzɜːrˈpeɪʃən/

usurpation

usurpation
Meaning
The act of taking someone's power or property illegally or by force.
Example
The general's usurpation of the presidency led to political unrest.
L'usurpation de la présidence par le général a conduit à des troubles politiques.
C2 adjective /ˈʌŋk.tʃu.əs/

unctuous

flatteur
Meaning
Excessively flattering or ingratiating; oily in texture.
Example
His unctuous tone made everyone uncomfortable.
Son ton flatteur a mis tout le monde mal à l'aise.
B2 verb /ˌʌndərˈmaɪn/

undermine

saper
Meaning
to gradually weaken or damage something or someone
Example
Constant criticism can undermine a child's confidence.
Les critiques constantes peuvent saper la confiance d'un enfant.
C1 adjective /ʌnˈskeɪðd/

unscathed

sain et sauf
Meaning
Without suffering any injury, damage, or harm.
Example
She escaped from the accident unscathed.
Elle a échappé à l'accident saine et sauve.
C1 adjective /ˌʌnprɪˈtɛnʃəs/

unpretentious

modeste
Meaning
modest; not attempting to impress others with appearance or importance
Example
She lives in an unpretentious home but is very happy.
Elle vit dans une maison modeste mais est très heureuse.
C1 verb /ʌnˈsɛtl/

unsettle

perturber
Meaning
To disturb or make someone feel anxious or uneasy.
Example
The sudden news unsettled the entire community.
La nouvelle soudaine a perturbé toute la communauté.
C1 adjective /ˌʌndərˈsteɪtɪd/

understated

sous-estimé
Meaning
Presented in a subtle and restrained way.
Example
She wore an elegant but understated dress.
Elle portait une robe élégante mais sous-estimée.
B2 adjective /ʌnˈberəbəl/

Unbearable

insupportable
Meaning
too painful, annoying, or unpleasant to tolerate; impossible to endure
Example
The heat in the desert was unbearable.
La chaleur dans le désert était insupportable.
B1 adverb /ʌnˈjuːʒuəli/

unusually

de manière inhabituelle
Meaning
in a way that is not typical or expected; to an uncommon degree
Example
It was unusually cold for this time of year.
Il faisait inhabituellement froid pour cette période de l'année.
C1 verb /ˌʌn.dəˈtʃɑːrdʒ/

undercharge

facturer moins
Meaning
To charge less than the correct or fair amount.
Example
The shopkeeper accidentally undercharged me for the groceries.
Le commerçant m'a accidentellement facturé moins pour les courses.
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.
C1 adjective /ˌʌnfɔːrˈsiːn/

unforeseen

Meaning
Not anticipated or predicted; unexpected.
Example
The project faced unforeseen challenges that delayed its completion.
C2 adjective /ˈɜːrsaɪn/

ursine

ursidé
Meaning
Relating to or resembling a bear.
Example
The man’s ursine strength amazed everyone.
La force ursidé de l'homme a étonné tout le monde.
B1 adjective /juːˈnaɪtɪd/

United

unis; ensemble; d'accord
Meaning
joined together for a common purpose; in agreement
Example
The team was united in their goal to win.
L'équipe était unie dans son objectif de gagner.
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.
A1 preposition/conjunction /ʌnˈtɪl/

until

jusqu'à
Meaning
up to the time of
Example
I will wait until you come back.
J'attendrai jusqu'à ce que tu reviennes.
A2 noun /ʌmˈbrɛlə/

umbrella

parapluie
Meaning
A device used for protection against rain or sun, typically consisting of a collapsible canopy mounted on a central rod.
Example
She opened her umbrella as it started to rain.
Elle a ouvert son parapluie quand il a commencé à pleuvoir.
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.
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 /ʌnˈflɛdʒd/

unfledged

inexpérimenté
Meaning
Inexperienced, immature, or not fully developed.
Example
The unfledged writer struggled to complete his first novel.
L'écrivain inexpérimenté a eu du mal à terminer son premier roman.
B2 noun /ʌnˈkaɪndnəs/

unkindness

méchanceté
Meaning
lack of kindness; cruel or inconsiderate behavior
Example
His unkindness hurt her feelings deeply.
Sa méchanceté a profondément blessé ses sentiments.
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.
B2 adjective /ˌʌndɪˈnaɪəbl/

Undeniable

indéniable
Meaning
impossible to deny or dispute; clearly true
Example
The evidence of his guilt was undeniable.
La preuve de sa culpabilité était indéniable.
B2 adjective /ʌnˈɡreɪt.fəl/

Ungrateful

ingrat
Meaning
not feeling or showing thanks for something done or given; not appreciating kindness
Example
She felt he was ungrateful for all the help she had given him.
Elle sentit qu'il était ingrat pour toute l'aide qu'elle lui avait donnée.
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 /juːˈtoʊpiə/

utopia

utopie
Meaning
An imagined perfect society or place where everything is ideal.
Example
Many philosophers dreamed of creating a utopia for humanity.
De nombreux philosophes ont rêvé de créer une utopie pour l'humanité.
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.
A1 adverb /ˈjuː.ʒu.ə.li/

Usually

habituellement; normalement
Meaning
in most cases; generally; as a rule
Example
I usually wake up at 7 AM every morning.
Je me réveille généralement à 7 h tous les matins.
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.
A1 verb /juːz/

use

utiliser
Meaning
to employ something for a purpose; to take advantage of
Example
I use my computer for work and entertainment.
J'utilise mon ordinateur pour travailler et me divertir.
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.
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 /ˈʌndərˌraɪt/

underwrite

garantir un soutien financier
Meaning
To guarantee financial support, especially by agreeing to cover losses or risks; in insurance, to assess and accept risks.
Example
The bank agreed to underwrite the company's new bond issue.
La banque a accepté de souscrire à la nouvelle émission d'obligations de l'entreprise.
A2 preposition /əˈpɒn/

upon

sur
Meaning
on or immediately after
Example
Upon hearing the news, he rushed to the hospital.
En entendant la nouvelle, il se précipita à l'hôpital.
C2 adjective /ʌnˈtɛmpərd/

untempered

non tempéré
Meaning
not moderated or softened; lacking proper balance or control
Example
The untempered anger of the crowd caused chaos.
La colère non tempérée de la foule a provoqué le chaos.
C2 verb /ʌnˈfɛtər/

unfetter

délier
Meaning
to release from restraint or restriction; to free
Example
The new law will unfetter small businesses from excessive regulations.
La nouvelle loi libérera les petites entreprises des régulations excessives.
B2 verb /ɜːrdʒ/

urge

exhorter
Meaning
to strongly encourage or try to persuade someone to do something
Example
Doctors urge patients to exercise regularly.
Les médecins exhortent les patients à faire de l'exercice régulièrement.
C1 adjective /ʌnˈsteɪtɪd/

unstated

non exprimé
Meaning
not expressed directly in words; implied or left unsaid
Example
The contract included several unstated expectations.
Le contrat incluait plusieurs attentes non exprimées.
B2 adjective /ˌʌnɪnˈtenʃənəl/

Unintentional

involontaire; accidentel
Meaning
not done on purpose; accidental
Example
The damage to the car was unintentional.
Les dégâts à la voiture étaient involontaires.
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.
B2 noun /ˈʌndərˌteɪkɪŋ/

undertaking

entreprise
Meaning
A task, project, or responsibility that someone agrees to do.
Example
Starting a new company is a difficult undertaking.
Lancer une nouvelle entreprise est une entreprise difficile.
C2 adjective /ʌpˈrɔːr.i.əs/

uproarious

extrêmement drôle
Meaning
Extremely funny or noisy; causing loud laughter or commotion.
Example
The comedian's jokes were absolutely uproarious.
Les blagues du comédien étaient absolument extrêmement drôles.
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.
B2 adjective /ˌʌnəˈfɪʃ.əl/

Unofficial

non officiel
Meaning
not officially authorized or confirmed; informal
Example
The unofficial results showed a close race.
Les résultats non officiels ont montré une course serrée.
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 /ʌnˈkɒm.prə.maɪ.zɪŋ/

Uncompromising

intransigeant, inflexible
Meaning
unwilling to change one's views or to agree about something; showing an unwillingness to make concessions to others
Example
He was uncompromising in his demand for a full apology.
Il était intransigeant dans sa demande d'excuses complètes.
C2 adjective /ʌnˈspɛərɪŋ/

unsparing

implacable
Meaning
Showing no mercy or generosity; harsh or severe.
Example
The critic was unsparing in his review of the play.
Le critique était implacable dans sa critique de la pièce.
C2 adjective ˌʌn.əˈseɪ.lə.bəl

unassailable

inaccessible
Meaning
Unable to be attacked, questioned, or defeated.
Example
An unassailable position ensures dominance.
Une position inaccessible assure la domination.
C1 noun /ˌʌnprɪˈdɪktəˌbɪləti/

unpredictability

imprévisibilité
Meaning
The quality of being impossible to predict or anticipate.
Example
The unpredictability of the weather made the trip uncertain.
L'imprévisibilité du temps a rendu le voyage incertain.
B1 verb /ʌnˈlɒk/

unlock

déverrouiller
Meaning
to open something that is locked; to make something accessible or available
Example
She used the key to unlock the door.
Elle a utilisé la clé pour déverrouiller la porte.
B2 adjective /ʌnˈdʒʌst/

Unjust

injuste; incorrecte
Meaning
not fair or right; morally wrong
Example
The punishment was unjust for such a minor offense.
La punition était injuste pour une infraction mineure.
B2 adjective /ʌnˈiːvən/

Uneven

irrégulier; rugueux
Meaning
not level or smooth; not regular or consistent
Example
The road was uneven and full of potholes.
La route était irrégulière et pleine de nids-de-poule.
C1 adjective /ʌnˈsoʊld/

unsold

invendu
Meaning
not sold; remaining without a buyer
Example
The unsold goods were returned to the warehouse.
Les marchandises invendues ont été retournées à l’entrepôt.
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.
C1 adjective /ʌnˈvaɪəbl/

unviable

invivable
Meaning
Not capable of working successfully; not feasible or practical.
Example
The project was deemed unviable due to high costs.
Le projet a été jugé invivable en raison des coûts élevés.
B1 adjective /ʌnˈfeər/

Unfair

injuste; déloyal;
Meaning
not right or just; treating people in a way that favors some over others
Example
It's unfair to blame her for something she didn't do.
C'est injuste de la blâmer pour quelque chose qu'elle n'a pas fait.
C1 adjective /ʌnˈsəʊʃəbl/

unsociable

asocial
Meaning
not enjoying the company of others; avoiding social interaction
Example
He became unsociable after moving to a new city.
Il est devenu asocial après avoir déménagé dans une nouvelle ville.
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.
B2 adjective /juːˈnæn.ɪ.məs/

Unanimous

unanime
Meaning
fully in agreement; shared by all
Example
The committee reached a unanimous decision.
Le comité a pris une décision unanime.
B2 adjective /ʌnˈkwɒl.ɪ.faɪd/

Unqualified

incompétent; non qualifié;
Meaning
not having the necessary skills or qualifications; complete or absolute
Example
He was unqualified for the engineering position due to lack of experience.
Il était inqualifié pour le poste d'ingénieur en raison de son manque d'expérience.
C1 adjective /ʌnˈkɛmpt/

unkempt

désordonné
Meaning
Having an untidy or disheveled appearance.
Example
He looked unkempt after sleeping outdoors all night.
Il avait l'air désordonné après avoir dormi dehors toute la nuit.
C1 adjective /ʌnˈweɪ.vər.ɪŋ/

unwavering

inébranlable
Meaning
Steady or resolute; not wavering.
Example
He showed unwavering dedication to his goal.
Il a montré un dévouement inébranlable à son objectif.
B2 adjective /ʌnˈwel.kəm/

Unwelcome

désagréable; non désiré; indésirable
Meaning
not wanted or accepted; not invited or pleasant
Example
The unwelcome news ruined their vacation plans.
Les mauvaises nouvelles ont ruiné leurs plans de vacances.
B1 adjective /ʌnˈnesəseri/

Unnecessary

inutile; superflu
Meaning
not needed; not required; pointless
Example
The meeting was unnecessary since all decisions were already made.
La réunion était inutile puisque toutes les décisions avaient déjà été prises.
C1 adjective /ʌnˈɜːrθli/

unearthly

surnaturel
Meaning
Strange or unnatural in a way that seems not of this world
Example
The forest was filled with an unearthly glow.
La forêt était remplie d'une lueur surnaturelle.
C2 adjective /ʌkˈsɔːriəs/

uxorious

excessivement dévoué à sa femme
Meaning
excessively fond of or submissive to one's wife
Example
He was so uxorious that he agreed with everything his wife said.
Il était tellement uxorien qu'il était d'accord avec tout ce que sa femme disait.
B2 adjective /ʌnˈfeɪθ.fəl/

Unfaithful

infidèle
Meaning
not loyal or true to a spouse, partner, or commitment
Example
He was unfaithful to his wife for many years.
Il a été infidèle à sa femme pendant de nombreuses années.
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.
C2 adjective /ʌnˈɡeɪnli/

ungainly

maladroit
Meaning
Awkward, clumsy, or lacking grace in movement or appearance.
Example
The tall boy moved in an ungainly manner.
Le garçon grand s'est déplacé de manière maladroite.