unhappiness
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B1 noun /ʌnˈhæp.i.nəs/

unhappiness

不幸
Meaning
the state of being unhappy; sadness or dissatisfaction
Example
Her constant unhappiness affected everyone around her.
彼女の絶え間ない不幸は周囲の人々に影響を与えた。
B2 adjective /ˈʌt.moʊst/

Utmost

最大の; 極限
Meaning
greatest; most extreme; maximum possible
Example
She showed utmost care while handling the fragile items.
彼女は壊れやすいアイテムを扱うとき、最大の配慮を示しました。
B2 adjective /ʌnˈlɔːfl/

Unlawful

違法; 不法
Meaning
not authorized by law; illegal
Example
The court declared the search unlawful.
裁判所はその捜索を不法と宣言しました。
B1 adjective /ʌnˈfeər/

Unfair

不公平; 不正;
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.
それは彼女がやっていないことを責めるのは不公平です。
B2 adjective /ʌnˈiːzi/

Uneasy

不安な; 心配な; 落ち着かない
Meaning
worried; anxious; uncomfortable; restless
Example
She felt uneasy about walking alone at night.
彼女は夜一人で歩くことに不安を感じていた。
C1 adjective /ˌʌnˈpɑr.də.nə.bəl/

Unpardonable

許されざる
Meaning
too bad to be forgiven; inexcusable
Example
His betrayal of trust was an unpardonable offense.
彼の裏切りは許されざる犯罪でした。
C2 adjective /juːˈnɪsənənt/

unisonant

調和の取れた
Meaning
Sounding together or in harmony.
Example
The unisonant voices created a powerful effect.
調和の取れた声が強力な効果を生み出した。
B2 adverb /ʌnˈdaʊtɪdli/

undoubtedly

間違いなく
Meaning
without a doubt, certainly
Example
He is undoubtedly the best player on the team.
彼は間違いなくチームで一番の選手です。
C1 adjective /ʌnˈkɒm.prə.maɪ.zɪŋ/

Uncompromising

譲歩しない, 妥協しない
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.
彼は完全な謝罪を要求する際に譲歩しませんでした。
C2 adjective /ˌʌltrəˈmʌndeɪn/

ultramundane

超越的
Meaning
Relating to things beyond the physical world; supernatural or transcendental.
Example
Philosophers often discuss ultramundane realities beyond human perception.
哲学者たちはしばしば人間の知覚を超えたウルトラムンデインな現実について議論します。
C1 verb /ʌnˈnɜːrv/

unnerve

自信を失う
Meaning
to make someone lose confidence, courage, or composure
Example
The hostile questions began to unnerve the witness.
敵意のある質問が証人を動揺させ始めた。
A2 preposition /əˈpɒn/

upon

の上で
Meaning
on or immediately after
Example
Upon hearing the news, he rushed to the hospital.
ニュースを聞いた後、彼は病院に急いだ。
C2 adjective /ˈʌŋk.tʃu.əs/

unctuous

お世辞
Meaning
Excessively flattering or ingratiating; oily in texture.
Example
His unctuous tone made everyone uncomfortable.
彼のお世辞な口調は皆を不快にさせた。
C2 verb /ʌnˈfrɒk/

unfrock

神父の職を剥奪する
Meaning
To remove a priest from his position or deprive someone of a rank.
Example
The corrupt priest was unfrocked after the investigation.
腐敗した神父は調査後に職を剥奪されました。
B1 adjective /ʌnˈklɪər/

unclear

不明確
Meaning
not easy to understand; vague or ambiguous
Example
The instructions were unclear, so I asked for clarification.
指示が不明確だったので、私は説明を求めました。
B1 adjective /ʌnˈnesəseri/

Unnecessary

不必要な; 無駄な
Meaning
not needed; not required; pointless
Example
The meeting was unnecessary since all decisions were already made.
その会議は必要ありませんでした、すべての決定はすでに下されていました。
C2 noun /juːˈkeɪs/

ukase

命令
Meaning
An authoritative decree or order, especially one issued by a sovereign or government.
Example
The czar issued a ukase restricting the freedom of the press.
ツァーは報道の自由を制限する命令を出しました。
C1 adjective /ˌʌnsəˈfɪstɪˌkeɪtɪd/

unsophisticated

未洗練
Meaning
Lacking worldly experience, refinement, or complexity.
Example
The villagers led an unsophisticated but happy life.
村人たちは未洗練だが、幸せな生活を送っていた。
C1 adjective /ʌnˈɡɑː.dɪd/

Unguarded

無防備な
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.
油断した瞬間、彼女はそのプロジェクトについての本当の気持ちを明かした。
B2 verb /ˌʌndərˈteɪk/

undertake

引き受ける
Meaning
to commit to and begin a task or project; to take on responsibility
Example
She decided to undertake a challenging project.
彼女は挑戦的なプロジェクトを始めることに決めました。
B2 adjective /ʌnˈsiːn/

Unseen

見えない; 前に見たり気づいたりしたことがない
Meaning
not previously seen or noticed; invisible; hidden
Example
The unseen forces of nature can be very powerful.
自然界の見えない力は非常に強力である可能性があります。
C2 adjective /ʌnˈtiːtʃəbəl/

unteachable

教えられない
Meaning
not able or willing to learn; resistant to instruction or guidance
Example
He was so stubborn that he became almost unteachable.
彼はとても頑固で、ほとんど教えられない状態だった。
C1 verb /ˌʌndəˈreɪt/

underrate

過小評価
Meaning
to fail to recognize the full value or importance of something or someone
Example
Many people underrate the benefits of regular exercise.
多くの人々が定期的な運動の利点を過小評価しています。
A2 adjective /ˈʌɡ.li/

Ugly

醜い; 嫌悪すべき; 恐ろしい
Meaning
unpleasant or repulsive in appearance; morally reprehensible
Example
The old building looked ugly after years of neglect.
長年の放置の後、その古い建物は醜く見えました。
C1 verb /ʌpˈruːt/

uproot

引き抜く
Meaning
To pull something out of the ground; to remove or displace completely.
Example
They uprooted the old tree from the garden.
彼らは庭から古い木を引き抜いた。
C1 noun /ˌʌnprɪˈdɪktəˌbɪləti/

unpredictability

予測不可能性
Meaning
The quality of being impossible to predict or anticipate.
Example
The unpredictability of the weather made the trip uncertain.
天気の予測不可能性は旅行を不確実にした。
B2 adjective /juːˈnæn.ɪ.məs/

Unanimous

全会一致
Meaning
fully in agreement; shared by all
Example
The committee reached a unanimous decision.
委員会は全会一致の決定を下しました。
B1 adjective /ʌnˈlaɪkli/

Unlikely

ありそうにない; 予想外の
Meaning
not likely to happen; improbable
Example
It's unlikely to rain today with such clear skies.
こんなに晴れた空では、今日は雨が降る可能性は低い。
C2 noun /ˈɜːrtʃɪn/

urchin

路上の子供
Meaning
a mischievous or poorly dressed child, often from the streets
Example
The ragged urchins played by the riverbank.
ぼろぼろの服を着た路上の子供たちが川辺で遊んでいた。
B2 noun /ˈjuː.sɪdʒ/

Usage

使用
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.
辞書は難しい言葉の正しい使い方を説明しています。
B1 adjective /ʌnɪmˈplɔɪd/

Unemployed

失業中
Meaning
without a job; not having paid work
Example
He has been unemployed for six months now.
彼はすでに6ヶ月間失業しています。
B2 adjective /ˌʌnrɪˈzɒlvd/

unresolved

未解決の
Meaning
not solved or settled; remaining undecided or unclear
Example
The dispute remains unresolved despite several meetings.
その問題は何度も会議をしたにもかかわらず未解決のままだ。
A1 noun /ˈʌŋkəl/

uncle

おじ/おじさん
Meaning
the brother of one's father or mother
Example
My uncle is visiting us next week.
私のおじさんは来週私たちを訪ねてきます。
C2 adjective /ʌnˈɡeɪnli/

ungainly

不器用
Meaning
Awkward, clumsy, or lacking grace in movement or appearance.
Example
The tall boy moved in an ungainly manner.
背の高い男の子は不器用な仕草で動いた。
B2 adverb /ʌnˈsɜːrtənli/

uncertainly

不確かに
Meaning
in a way that shows doubt or lack of certainty
Example
She glanced uncertainly at the complicated instructions.
彼女は複雑な指示を不確かに見つめた。
B1 adjective /ˌʌnbɪˈliːvəbəl/

Unbelievable

信じられない
Meaning
impossible to believe; extremely surprising or remarkable
Example
The magician's performance was absolutely unbelievable.
魔法使いのパフォーマンスは絶対に信じられなかった。
C1 adjective /ʌnˈɜːrθli/

unearthly

超自然的
Meaning
Strange or unnatural in a way that seems not of this world
Example
The forest was filled with an unearthly glow.
森は超自然的な輝きで満たされていました。
B2 adverb /ʌnˈplɛzəntli/

unpleasantly

不快に
Meaning
in a way that causes discomfort, annoyance, or displeasure; in an unfriendly or disagreeable manner
Example
The room was unpleasantly hot during the afternoon.
午後、その部屋は不快に暑かった。
C1 adjective /ˌʌn.əˈdʌl.tə.reɪ.tɪd/

Unadulterated

純粋
Meaning
not mixed or diluted with any different or extra elements; pure
Example
She felt unadulterated joy when she heard the news.
彼女はそのニュースを聞いたとき、純粋な喜びを感じました。
B2 adjective /ˌʌnprɪˈdɪktəbəl/

unpredictable

予測できない
Meaning
not able to be predicted; changing suddenly and unexpectedly
Example
The weather in this region is highly unpredictable.
この地域の天気はとても予測できない。
C2 adjective /ʌnˈtʃeɪst/

Unchaste

不道徳な; 不潔な;
Meaning
not celibate; having engaged in sexual relations; lacking moral purity
Example
The conservative society considered her behavior unchaste and improper.
保守的な社会は彼女の行動を不道徳で不適切だと考えた。
C1 noun /ʌnkənˈsɜːrn/

Unconcern

無関心
Meaning
lack of worry or interest; indifference
Example
She showed complete unconcern about the criticism.
彼女は批評に対して完全に無関心を示しました。
B2 adjective /ʌnhaɪˈdʒiːnɪk/

Unhygienic

不衛生な; 適切な衛生状態の欠如
Meaning
not clean; lacking proper sanitation
Example
The restaurant was closed due to unhygienic conditions in the kitchen.
レストランは不衛生な厨房の状態で閉店しました。
C1 adjective ʌnɪnˈhæbɪtəbəl

uninhabitable

住めない
Meaning
Not suitable or safe for people to live in.
Example
Rapid urbanization can make cities uninhabitable.
急速な都市化は都市を住めない場所にする可能性があります。
B1 adjective /ʌnˈpɒpjʊlə/

unpopular

不人気な
Meaning
not liked or supported by many people
Example
The decision was unpopular with the public.
その決定は世間で不人気だった。
C1 adjective /ʌnˈmɒdɪfaɪd/

unmodified

未変更の
Meaning
not changed from its original form or state
Example
The data was used in its unmodified form for analysis.
データは未変更の形で分析に使用された。
C1 noun /ˈʌndərˌwɜːrld/

underworld

アンダーワールド
Meaning
The criminal world of organized crime or the mythical world of the dead.
Example
The detective spent years studying the secrets of the underworld.
探偵はアンダーワールドの秘密を何年も研究していました。
B2 adjective /ˈʌpˌhɪl/

Uphill

困難な; 大きな努力が必要な; 上向きの傾斜
Meaning
difficult; requiring great effort; sloping upward
Example
Learning a new language can be an uphill battle.
新しい言語を学ぶことは困難な戦いである可能性があります。
C2 verb /ˈʌndərˌraɪt/

underwrite

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.
C1 adjective ʌnˈjiːl.dɪŋ

unyielding

揺るぎないまたは堅い
Meaning
Not easily broken or giving in to pressure.
Example
Her unyielding determination helped her overcome all challenges.
彼女の揺るぎない決意が彼女をすべての挑戦を乗り越えさせました。
A2 noun /ˈjuːnɪt/

unit

ユニット
Meaning
an individual thing or person regarded as a single and complete entity
Example
Each unit in the production line is carefully tested.
生産ラインの各ユニットは慎重にテストされます。
B2 adjective /ʌnˈdɪvaɪdɪd/

Undivided

分割されていない; 完全な; 分けられていない
Meaning
whole; complete; not separated or split
Example
The team showed undivided attention to the coach's instructions.
チームはコーチの指示に対して分け隔てなく注意を示しました。
B2 verb /ɜːrdʒ/

urge

促す
Meaning
to strongly encourage or try to persuade someone to do something
Example
Doctors urge patients to exercise regularly.
医者は患者に定期的に運動するように促します。
B2 adjective /ʌnˈdʒʌst/

Unjust

不当な; 不正な
Meaning
not fair or right; morally wrong
Example
The punishment was unjust for such a minor offense.
その罰は軽微な違反に対して不当でした。
C1 adjective /ˌʌnɪmˈplɔɪəbəl/

unemployable

雇用不適格
Meaning
Not able to be employed; lacking the skills or qualities necessary for employment
Example
Due to his criminal record, he was considered unemployable in most companies.
彼の犯罪歴のため、ほとんどの会社で雇用不適格と見なされた。
C1 adjective /ˌʌnfɔːrθˈkʌmɪŋ/

unforthcoming

協力的でない
Meaning
Not willing to talk or provide information; uncooperative.
Example
The witness was unforthcoming about what he had seen.
証人は見たことについて協力的でなかった。
C1 adjective /ʌnˈdɔːntɪd/

Undaunted

不屈の; 勇敢な; 断固たる;
Meaning
not intimidated or discouraged by difficulty, danger, or disappointment
Example
Despite the setbacks, she remained undaunted in pursuing her goals.
挫折にもかかわらず、彼女は目標を追い続ける中で不屈であり続けた。
C1 verb /ʌnˈɜːθ/

unearth

発掘する
Meaning
To dig up from the ground or to discover something hidden.
Example
Archaeologists unearthed ancient artifacts at the site.
考古学者たちはサイトで古代の遺物を発掘した。
A2 noun /ˈʌndərweər/

underwear

下着
Meaning
Clothing worn beneath outer clothes, typically next to the skin.
Example
He bought new underwear for the trip.
彼は旅行のために新しい下着を買った。
C2 adjective /ʌnˈwəʊntɪd/

unwonted

異常
Meaning
Unusual, uncommon, or out of the ordinary.
Example
She spoke with an unwonted gentleness that surprised everyone.
彼女は予想外の優しさで話し、皆を驚かせました。
C1 adjective /ˌʌnfɔːrˈsiːn/

unforeseen

Meaning
Not anticipated or predicted; unexpected.
Example
The project faced unforeseen challenges that delayed its completion.
B2 adverb /ˈɜːrdʒəntli/

urgently

緊急に
Meaning
in a way that requires immediate attention or action
Example
The patient urgently needs medical attention.
患者は緊急に医療処置が必要です。
C2 adjective /ˌʌn.rɪˈdʒɛn.ər.ət/

unregenerate

頑固
Meaning
Not reformed or showing no signs of change; stubbornly refusing to reform or repent.
Example
He remained an unregenerate opponent of progress.
彼は進歩の頑固な反対者であり続けた。
A2 conjunction /ʌnˈlɛs/

unless

もし～でない限り
Meaning
except if
Example
We won't go unless it stops raining.
雨が止まない限り、私たちは行きません。
B2 verb /ˌʌndərˈɡoʊ/

undergo

経験する
Meaning
to go through something, especially something unpleasant or difficult
Example
She had to undergo surgery to recover.
彼女は回復するために手術を受けなければなりませんでした。
B2 adjective /ʌnˈbæləns/

Unbalanced

不均衡な; 不安定な
Meaning
not balanced; lacking stability or equilibrium; mentally unstable
Example
The unbalanced table kept wobbling.
不均衡なテーブルは揺れ続けていた。
C1 verb /ʌnˈrævəl/

unravel

Meaning
To undo twisted or knitted threads; to solve or explain something complicated.
Example
The detective worked hard to unravel the mystery.
B2 adjective /ˌʌnəˈweər/

Unaware

無自覚; 知らない; 気づかない
Meaning
not knowing or realizing; having no knowledge of something
Example
She was completely unaware of the danger.
彼女はその危険に完全に気づいていなかった。
C1 adjective /ʌnˈsoʊld/

unsold

未販売の
Meaning
not sold; remaining without a buyer
Example
The unsold goods were returned to the warehouse.
未販売の商品は倉庫に戻されました。
B2 adjective /ˌʌn.kəʊˈɒp.ər.ə.tɪv/

uncooperative

非協力的な
Meaning
not willing to help or work with others; unhelpful
Example
The witness was uncooperative and refused to answer questions.
証人は非協力的で、質問に答えることを拒否した。
C1 adjective /ʌnˈtɛnəbl/

untenable

維持できない
Meaning
not able to be maintained or defended against attack or objection
Example
The politician resigned when his position became untenable.
政治家は彼の立場が維持できなくなったときに辞職しました。
B2 noun /ˌʌnəˌveɪləˈbɪləti/

unavailability

利用不可
Meaning
The state of being not available or not accessible.
Example
The unavailability of the manager caused a delay in the project.
マネージャーの不在がプロジェクトの遅延を引き起こした。
B2 adverb /ˈʌt.ə.li/

Utterly

完全に; 絶対に; 完全に
Meaning
completely; absolutely; totally
Example
The movie was utterly boring and I fell asleep.
その映画は完全に退屈で、私は寝てしまいました。
C1 noun /ˈʌp.tɜːn/

upturn

改善
Meaning
An improvement or upward trend in a situation, especially in business or economy.
Example
The company experienced an upturn in sales last quarter.
その会社は先月、売上の改善を経験しました。
C1 adjective /ʌnˈtaɪərɪŋ/

Untiring

不屈の; 絶え間ない; 疲れを知らない
Meaning
continuing without stopping; persistent; tireless
Example
Her untiring efforts finally led to success.
彼女の不屈の努力は最終的に成功に繋がった。
A2 adjective /ʌnˈlʌki/

Unlucky

不運; ラッキーでない
Meaning
having bad luck; unfortunate
Example
He was unlucky to miss the winning shot.
彼は勝つシュートを外して不運だった。
A2 adjective /ʌnˈhæp.i/

Unhappy

不幸な; 悲しい
Meaning
not happy; feeling sad or displeased; unfortunate or undesirable
Example
He was unhappy with the results of his exam.
彼は試験の結果に不満でした。
C2 verb /juˈzɜrp/

usurp

奪取
Meaning
to take someone's position of power illegally or by force
Example
The general tried to usurp the king's throne.
将軍は王の玉座を奪おうとした。
C1 verb /ˌʌndərˈvæljuː/

undervalue

過小評価する
Meaning
To assign too low a value or importance to something or someone.
Example
She felt that her boss consistently undervalued her contributions.
彼女は自分の上司が彼女の貢献を一貫して過小評価していると感じていた。
C2 noun/verb /ˈʌpˌkæst/

upcast

上に投げる
Meaning
Verb: To cast or throw upward. Noun: Something thrown or directed upward.
Example
The fisherman upcast his net into the air.
漁師は彼の網を空中に投げた。
C1 noun /ˈʌndərˌstʌdi/

understudy

アンダースタディ
Meaning
An actor who learns another's role to act as a replacement if needed.
Example
The understudy performed when the lead actor fell ill.
主役の俳優が病気になったとき、アンダースタディが演じました。
A2 adjective /ʌnˈtaɪdi/

Untidy

散らかった; 無秩序な;
Meaning
not neat or orderly; messy and disorganized
Example
Her untidy room was filled with clothes scattered everywhere.
彼女の散らかった部屋は、どこにでも散らばった服でいっぱいでした。
C1 verb /ˌʌndərˈsteɪt/

understate

過小評価する
Meaning
To describe something as being less important or serious than it really is.
Example
He tends to understate his achievements.
彼は自分の業績を過小評価する傾向があります。
B2 noun ˌjuːtɪlaɪˈzeɪʃən

utilization

利用
Meaning
The action of making practical and effective use of something.
Example
Increased plastic utilization calls for better waste management.
プラスチックの利用増加は、より良い廃棄物管理を求めています。
B1 adjective /ʌnˈfɔːr.tʃən.ət/

Unfortunate

不運な; 残念な
Meaning
having bad luck; regrettable or unlucky
Example
It was unfortunate that the meeting was cancelled at the last minute.
会議が最後の瞬間にキャンセルされたのは不運でした。
B2 adjective /ˌʌnəˈvɔɪdəbəl/

Unavoidable

避けられない; 避けることができない; 必然的な
Meaning
cannot be avoided; certain to happen; inevitable
Example
The meeting is unavoidable, so we must attend.
その会議は避けられないので、出席しなければなりません。
A2 verb /ʌpˈset/

upset

困らせる
Meaning
to make someone worried, sad, or angry; to disturb
Example
The bad news upset everyone.
悪いニュースはみんなを upset した。
B1 adjective /ʌnˈwel/

Unwell

体調不良; 病気
Meaning
not in good health; feeling sick or ill
Example
She has been feeling unwell since yesterday.
彼女は昨日から体調が悪い。
C1 adjective /ʌnˈfɛtərd/

unfettered

自由な
Meaning
not restricted or confined; free
Example
The artist enjoyed unfettered freedom of expression.
アーティストは制限のない表現の自由を楽しんだ。
B2 adjective /ˌʌndɪˈzaɪərəbl/

Undesirable

望ましくない; 有害な; 不快な
Meaning
not wanted or wished for; harmful or unpleasant
Example
The new policy had several undesirable consequences.
新しい政策は幾つか望ましくない結果を招いた。
B2 adjective ʌnˈprɛsɪˌdɛntɪd

unprecedented

前例のない
Meaning
Never done or known before; without previous example.
Example
Unprecedented advancements in science changed human lives.
科学における前例のない進歩は人間の生活を変えました。
B2 verb /ʌnˈveɪl/

unveil

発表する
Meaning
to reveal or disclose something, especially in a formal manner
Example
The company will unveil a new product next week.
会社は来週新製品を発表します。
A1 preposition/conjunction /ʌnˈtɪl/

until

まで
Meaning
up to the time of
Example
I will wait until you come back.
私はあなたが戻るまで待ちます。
C1 adjective /ʌnˈweɪ.vər.ɪŋ/

unwavering

揺るぎない
Meaning
Steady or resolute; not wavering.
Example
He showed unwavering dedication to his goal.
彼は目標に対する揺るぎない献身を示しました。
A1 pronoun /ʌs/

us

私たち
Meaning
used to refer to the speaker and one or more other people as the object of a verb or preposition
Example
She gave us a gift.
彼女は私たちに贈り物をくれました。
C1 adjective /ˌʌnəˈkaʊntəbl/

unaccountable

説明できない
Meaning
Not able to be explained or justified.
Example
She felt an unaccountable fear as she entered the dark room.
彼女は暗い部屋に入ると説明できない恐怖を感じた。
C1 adjective /ʌnˈsiːmli/

unseemly

不適切な
Meaning
Not proper or appropriate in behavior or appearance; unbecoming.
Example
His unseemly remarks embarrassed everyone at the dinner table.
彼の不適切な発言はディナーテーブルで皆を困らせました。
B2 noun /ˈʌpˌkiːp/

up-keep

維持管理
Meaning
The process or cost of maintaining something in good condition.
Example
The upkeep of the old house is very expensive.
古い家の維持管理は非常に高価です。
B1 adjective /ʌnˈsɜːrtən/

Uncertain

不確か
Meaning
not able to be relied on; not known or definite; not having reliable knowledge
Example
I am uncertain about my future career plans.
私は自分の将来のキャリア計画に不確かさを感じています。
B2 noun ˈjuːnəti

unity

団結
Meaning
The state of being united or joined as a whole.
Example
Unity among people led to victory.
人々の団結が勝利をもたらした。
B2 adjective /ʌnˈfɪt/

Unfit

不適格; 不適当;
Meaning
not in good physical condition; unsuitable or inappropriate
Example
He was declared unfit for military service due to his poor health.
彼は健康状態が悪いため、軍務には不適格と宣告されました。
B2 adjective /ʌnprɪˈpɛrd/

Unprepared

準備不足
Meaning
not ready or able to deal with something
Example
He was unprepared for the difficult exam.
彼は難しい試験に準備していなかった。
C1 noun ˌʌndərˈprɪvəlɪdʒd ɡruːps

underprivileged groups

恵まれないグループ
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.
恵まれないグループは社会的なイニシアティブから利益を得ます。
B2 adjective /ˌʌnkənˈvɛnʃənl/

unconventional

型破りの
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.
彼女の型破りの教育アプローチは、生徒たちに創造的に考えるよう促しました。
C2 adjective /ʌnˈkɒnʃənəbl/

unconscionable

不正当な
Meaning
shockingly unfair or unreasonable
Example
The company made unconscionable profits from the crisis.
その会社は危機から不正当な利益を得ました。
C1 adjective /ˌʌnəˈsjuːmɪŋ/

unassuming

控えめな
Meaning
Not pretentious or arrogant; modest.
Example
Despite his success, he remained unassuming and humble.
成功にもかかわらず、彼は控えめで謙虚なままでした。
C1 adjective /ʌlˈtɪəriər/

ulterior

隠された動機
Meaning
hidden or secret, often with a selfish motive
Example
He invited her with an ulterior motive.
彼は隠された動機で彼女を招待した。
C2 adjective /ʌnˈblʌʃɪŋ/

Unblushing

恥知らずな; 図々しい
Meaning
showing no shame or embarrassment; boldly shameless
Example
He told the unblushing lie without any hesitation.
彼はためらうことなく無恥な嘘をついた。
B1 adjective /ʌnˈkaʊntəbəl/

Uncountable

数えきれない; 無限の
Meaning
too many to be counted; innumerable; infinite in quantity
Example
There are uncountable stars in the night sky.
夜空には無数の星があります。
A1 interjection /ʌ/

uh

ああ
Meaning
a sound people make when they hesitate or are unsure what to say next.
Example
Uh, I’m not sure if that’s the right answer.
ああ、それが正しい答えかどうかはわからない。
B2 noun /ˈʌndərˌteɪkɪŋ/

undertaking

事業
Meaning
A task, project, or responsibility that someone agrees to do.
Example
Starting a new company is a difficult undertaking.
新しい会社を立ち上げるのは難しい事業です。
B2 adverb /ʌnˈkɒnʃəsli/

unconsciously

無意識に
Meaning
without being aware of one's actions or surroundings
Example
She unconsciously tapped her foot to the rhythm of the music.
彼女は無意識に音楽のリズムに合わせて足をトントンしていた。
C1 adjective /ʌnˈsəʊʃəl/

unsocial

非社交的な
Meaning
not enjoying the company of others; avoiding social interaction; contrary to social norms
Example
He prefers unsocial hours so he can work alone without interruptions.
彼は一人で働くために非社交的な時間を好む。
C2 adjective /ˌʌnprəˈpɪʃəs/

unpropitious

不運な
Meaning
Not giving or indicating a good chance of success; unfavorable.
Example
The team began their journey under unpropitious weather conditions.
チームは不運な天候の中で旅を始めました。
B2 adjective /ʌnˈɡreɪt.fəl/

Ungrateful

恩知らず
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.
彼女は、彼が彼女が与えたすべての助けに対して恩知らずだと感じた。
C1 adjective /ʌnˈsɪvəlaɪzd/

Uncivilized

未開の; 野蛮な;
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.
探検家たちはアマゾンの雨林の奥深くで未開の部族に出会った。
C2 verb /ʌnˈɑːrm/

unarm

武装解除する
Meaning
to remove weapons from someone or to deprive of means of attack or defense
Example
The soldiers were ordered to unarm the prisoners.
兵士たちは囚人の武装を解除するよう命じられた。
B1 adjective /ʌnˈeɪ.bəl/

Unable

できない
Meaning
lacking the power, skill, or means to do something
Example
He was unable to attend the meeting.
彼は会議に出席できませんでした。
A1 verb /ˌʌndərˈstænd/

understand

理解する
Meaning
to know the meaning of something; to comprehend
Example
Do you understand the instructions?
指示が理解できますか?
B2 adjective /ʌnˈberəbəl/

Unbearable

耐えられない
Meaning
too painful, annoying, or unpleasant to tolerate; impossible to endure
Example
The heat in the desert was unbearable.
砂漠の暑さは耐えられなかった。
B2 verb ˈjuːnɪfaɪ

unify

統一する
Meaning
To make or become united, uniform, or whole; to bring together into a single unit.
Example
Adolescents unify with peers for social acceptance.
若者たちは社会的受け入れのために仲間と統一します。