Undisturbed
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B2 adjective /ˌʌndɪˈstɜːrbd/

Undisturbed

邪魔されない
Meaning
not interrupted or interfered with; calm and peaceful
Example
She slept undisturbed for eight hours.
彼女は8時間、邪魔されずに眠った。
C1 adjective /ʌnˈsəʊʃəbl/

unsociable

非社交的な
Meaning
not enjoying the company of others; avoiding social interaction
Example
He became unsociable after moving to a new city.
新しい街に引っ越してから、彼は非社交的になった。
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。
C1 adjective /ʌnˈkwaɪ.ət/

Unquiet

落ち着かない; 不安な; 動揺した
Meaning
restless; unable to remain still or quiet; anxious or troubled
Example
She spent an unquiet night worrying about the exam results.
彼女は試験結果を心配して落ち着かない夜を過ごした。
B1 adjective /ʌnˈkaɪnd/

Unkind

無愛想; 不親切
Meaning
cruel; not nice or caring toward others
Example
It was unkind of him to make fun of her appearance.
彼が彼女の外見をからかうのは不親切だった。
C1 noun /ˈʌlsər/

ulcer

Meaning
a sore on the skin or a mucous membrane that does not heal easily
Example
The doctor prescribed medicine to treat the stomach ulcer.
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。
C1 adjective /ˌʌnɪˈkwɪvəkəl/

unequivocal

明確
Meaning
Leaving no doubt; clear and unambiguous
Example
She gave an unequivocal answer to the question.
彼女は質問に対して明確な答えを出しました。
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。
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 adjective /ʌnəˈfreɪd/

unafraid

恐れない
Meaning
Not feeling fear; brave or courageous
Example
She walked into the dark room, unafraid of what might be inside.
彼女は暗い部屋に入り、恐れないで何があるかを見た。
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。
C2 adjective /ʌnˈspɛərɪŋ/

unsparing

容赦ない
Meaning
Showing no mercy or generosity; harsh or severe.
Example
The critic was unsparing in his review of the play.
批評家は彼の演劇レビューで容赦なかった。
C1 adjective /ʌnˈkuːθ/

uncouth

無作法
Meaning
Lacking good manners, refinement, or grace; awkward or rough.
Example
His uncouth behavior shocked the guests at the party.
彼の無作法な行動はパーティーのゲストを驚かせました。
C2 adjective /ɜːrˈbeɪn/

urbane

洗練された
Meaning
showing polished manners, refinement, and sophistication
Example
He was an urbane gentleman who charmed everyone at the party.
彼はパーティーでみんなを魅了した洗練された紳士だった。
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。
B2 adjective /ʌnˈfeɪ.vər.ə.bəl/

Unfavourable

不利な; 逆境の
Meaning
not helpful or advantageous; adverse
Example
The weather conditions were unfavourable for our outdoor event.
悪天候は私たちの屋外イベントには不利でした。
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。
B2 adjective /ʌnˈfeɪθ.fəl/

Unfaithful

不忠実
Meaning
not loyal or true to a spouse, partner, or commitment
Example
He was unfaithful to his wife for many years.
彼は何年も妻に不忠実でした。
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。
B2 adjective /ʌnˈhɜːrt/

unhurt

無傷
Meaning
Not injured or harmed.
Example
She walked away from the accident unhurt.
彼女は事故から無傷で歩き去った。
C1 adjective /ʌnˈtʌtʃəbəl/

Untouchable

触れられない; 批判や攻撃を受けない
Meaning
not able to be touched or affected; beyond criticism or attack
Example
The CEO seemed untouchable despite the scandal.
CEOはスキャンダルにもかかわらず、アンタッチャブルのように見えた。
C2 adjective ˌʌn.əˈseɪ.lə.bəl

unassailable

打破できない
Meaning
Unable to be attacked, questioned, or defeated.
Example
An unassailable position ensures dominance.
打破できない位置は支配を確保します。
B1 noun /juːˈten.səlz/

Utensils

食器
Meaning
tools or implements used for cooking, eating, or serving food
Example
Please wash all the cooking utensils after preparing dinner.
ディナーを準備した後、すべての料理用具を洗ってください。
B1 verb /ʌnˈræp/

unwrap

包みを開ける
Meaning
remove wrapping or covering from something; reveal something gradually or clearly
Example
She carefully unwrapped the gift with excitement.
彼女は興奮しながら慎重に贈り物の包みを開けた。
C1 noun /ˈʌndərˌteɪkər/

undertaker

葬儀屋
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.
葬儀屋は葬儀のために遺体を準備しました。
B1 adjective /ʌnˈwɒn.tɪd/

Unwanted

望まれない
Meaning
not desired or welcome; not wanted
Example
He felt like an unwanted guest at the meeting.
彼は会議で望まれない客のように感じた。
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。
B2 adjective /ʌnˈbreɪkəbəl/

Unbreakable

壊れたり損傷したりできない; とても強くて耐久性がある
Meaning
not able to be broken or damaged; very strong and durable
Example
Their friendship formed an unbreakable bond.
彼らの友情は壊れない絆を形成しました。
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。
C2 verb /ˈʌndərˌmæn/

underman

人手不足
Meaning
to supply with fewer workers or personnel than needed
Example
The hospital was undermanned during the flu outbreak.
インフルエンザの流行時に病院は人手不足でした。
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。
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。
B2 adjective /ʌnˈθɪŋkəbl/

Unthinkable

想像を絶する
Meaning
impossible to conceive or imagine; beyond belief or consideration
Example
It was unthinkable that such a tragedy could happen in our peaceful town.
私たちの平和な街でそのような悲劇が起こるなんて、想像を絶していました。
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 adjective /ʌnˈskɪld/

Unskilled

未熟な; 技術のない労働者
Meaning
lacking technical training or ability; not requiring special skills
Example
Many unskilled workers are looking for training opportunities.
多くの未熟な労働者がトレーニングの機会を探しています。
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 verb /ˌʌn.dɪˈsiːv/

undeceive

誤解を解く
Meaning
To free someone from a misconception or false belief.
Example
She tried to undeceive him about the false rumors.
彼女は嘘の噂について彼を誤解を解こうとしました。
B2 adjective /ˈʌt.ɚ/

Utter

完全な; 絶対的な; 全体の
Meaning
complete; absolute; total
Example
The movie was an utter disaster at the box office.
その映画は興行収入で完全に失敗しました。
B1 adjective /ʌnˈnoʊn/

Unknown

未知
Meaning
not known or identified; unfamiliar
Example
The author of this letter remains unknown.
この手紙の著者は不明のままです。
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。
B2 noun /ʌnˈsɜːrtənti/

Uncertainty

不確実性; 疑念または確信の欠如
Meaning
the state of being uncertain; doubt or lack of sureness
Example
The uncertainty about the weather delayed our trip.
天気についての不確実性が私たちの旅行を遅らせた。
C1 adjective /ʌnˈtʃælɪndʒd/

Unchallenged

挑戦されていない; 反対なしに受け入れられた; ライバルなし
Meaning
not disputed or questioned; accepted without opposition; having no rival
Example
He remained the unchallenged champion for five years.
彼は5年間、挑戦されていないチャンピオンであり続けました。
C1 adjective /ˌʌnəkˈnɒlɪdʒd/

unacknowledged

認められない
Meaning
Not recognized, admitted, or accepted; ignored or unnoticed
Example
Her contributions to the project went unacknowledged.
彼女のプロジェクトへの貢献は認められなかった。
B1 adjective /ˈɜːrdʒənt/

Urgent

緊急
Meaning
requiring immediate action or attention; pressing
Example
The patient needs urgent medical attention.
患者は緊急の医療支援が必要です。
A1 adjective /ˈjuːs.fəl/

Useful

役に立つ; 実用的な
Meaning
having a beneficial purpose; practical
Example
This tool is very useful for fixing problems.
このツールは問題を解決するために非常に役立ちます。
C2 adjective /ˌʌn.təˈwɔːrd/

untoward

予期しない
Meaning
Unexpected and inappropriate or inconvenient.
Example
The meeting ended without any untoward incidents.
会議は予期しない事件なしで終了しました。
C1 adjective /ʌnˈθɪŋkɪŋ/

unthinking

軽率な
Meaning
done without careful thought; automatic or thoughtless
Example
His unthinking remark hurt her feelings.
彼の軽率な発言は彼女の気持ちを傷つけた。
B2 noun /ʌnˈkɒnʃəsnəs/

unconsciousness

無意識
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.
事故の後、彼は数時間意識を失っていた。
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 /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。
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。
B1 adjective /ʌnˈjuzd/

Unused

未使用の; 使われていない
Meaning
not being used; not having been used before
Example
There are many unused rooms in this old mansion.
この古い館には未使用の部屋がたくさんあります。
C1 adjective /ˌʌnəˈteɪnəbl/

unattainable

達成不可能な
Meaning
impossible to achieve, reach, or accomplish
Example
For many, becoming a professional athlete remains an unattainable dream.
多くの人にとって、プロのアスリートになることは依然として達成不可能な夢です。
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。
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。
B2 adjective /ʌnˌkənˈfɜːmd/

Unconfirmed

未確認; 未検証;
Meaning
not confirmed as true or definite; not verified or substantiated
Example
The report remains unconfirmed until we receive official verification.
報告書は公式の確認が得られるまで未確認のままです。
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。
C1 adjective /ˌʌnˈɪntɪmeɪtɪŋ/

unintimating

示唆しない
Meaning
Not giving a hint or suggestion; not indicating.
Example
His unintimating tone gave no clue of his true feelings.
彼の示唆しない口調は彼の本当の気持ちを示すものではありませんでした。
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。
B2 adjective /ˌjuːnɪˈvɜːrsəl/

Universal

普遍的な
Meaning
applicable to all cases; existing everywhere
Example
Music is a universal language that everyone understands.
音楽は誰もが理解できる普遍的な言語です。
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。
B1 preposition, adverb, adjective /ˌʌndərˈniːθ/

underneath

下に、下側に
Meaning
Located directly below or beneath something
Example
The keys were hidden underneath the pile of papers.
鍵は紙の山の下に隠されていました。
C1 adjective /ˈʌndərhænd/

underhand

不正
Meaning
done secretly and dishonestly; deceitful
Example
The politician was accused of using underhand tactics to win the election.
その政治家は選挙に勝つために不正な手段を使ったとして非難されました。
C2 noun juːˈbɪkwɪti

ubiquity

遍在性
Meaning
The fact of appearing everywhere or of being very common.
Example
The ubiquity of smartphones has transformed communication.
スマートフォンの遍在性は、コミュニケーションを変革しました。
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。
B1 adjective /ˈɜːrbən/

urban

都市的な
Meaning
related to, characteristic of, or situated in a city or town
Example
Urban areas often have higher population density than rural areas.
都市部は、農村部よりも人口密度が高いことがよくあります。
C2 noun /ˈjuːzjuːfrʌkt/

usufruct

使用権
Meaning
The legal right to use and enjoy the benefits of someone else’s property without owning it.
Example
The tenant had the usufruct of the land but not its ownership.
借家人は土地の使用権を持っていたが、所有権はなかった。
A1 noun /ˌjuːnɪˈvɜːrsɪti/

university

大学
Meaning
an institution of higher education and research, which grants academic degrees
Example
She is studying law at the university.
彼女は大学で法学を学んでいます。
B1 adjective /ˌʌnsəkˈsesfl/

Unsuccessful

失敗した; 成功しなかった;
Meaning
not achieving desired aims or results; failing to accomplish a purpose
Example
His unsuccessful attempt to climb the mountain left him disappointed.
彼の失敗した山登りの試みは彼を失望させた。
C2 noun /ˈʌŋkʃən/

unction

聖別
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.
司祭は厳粛に聖別の儀式を行った。
C2 noun /ˌjuːnɪˈtɛəriən/

unitarian

ユニタリアン
Meaning
A person who believes that God exists as one entity rather than as a Trinity; a member of a religious denomination that emphasizes individual freedom of belief.
Example
The Unitarian church is known for its inclusive and open-minded approach.
ユニタリアン教会は、その包括的で開かれた考え方で知られています。
A2 adjective /ʌnˈhel.θi/

Unhealthy

不健康な; 健康に悪い
Meaning
harmful to health; not in good health; detrimental to well-being
Example
Eating too much fast food is unhealthy for your body.
ファーストフードを食べ過ぎることは、あなたの体に不健康です。
C1 adjective /ʌnˈsaɪtli/

unsightly

見苦しい
Meaning
Unpleasant to look at; ugly.
Example
The garbage pile created an unsightly view in the park.
ゴミの山は公園に見苦しい景色を作り出した。
C1 adjective /ʌnˈɒnəd/

unhonoured

敬われない
Meaning
not respected or given the recognition that is deserved; treated without honor
Example
He felt unhonoured after his years of service were ignored.
長年の奉仕が無視され、彼は敬われないと感じた。
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 adjective + noun ʌnˈpresɪdentɪd ˈnɒlɪdʒ

unprecedented knowledge

前例のない知識
Meaning
Information or understanding that has never been obtained or achieved before.
Example
Artemis will provide unprecedented knowledge about the solar system.
アルテミスは太陽系に関する前例のない知識を提供する。
B2 adjective /ˌʌnˈkɔːrdɪneɪtɪd/

uncoordinated

不器用; 協調性のない
Meaning
lacking coordination, not well-organized or clumsy in movement
Example
His movements were uncoordinated, making him prone to accidents.
彼の動きは不器用で、事故を起こしやすかった。
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。
A2 verb /ʌpˈdeɪt/

update

更新
Meaning
to make something more modern or current; to provide new information
Example
Please update your software regularly.
定期的にソフトウェアを更新してください。
C1 adjective /ˈʌpərˌmoʊst/

uppermost

最上
Meaning
situated at the highest place or most important
Example
Her family's safety was uppermost in her mind during the crisis.
危機の間、彼女の心の中で最も重要なのは家族の安全でした。
C1 noun /ˌʌnbɪˈliːf/

Unbelief

不信
Meaning
lack of religious belief; skepticism or doubt
Example
His unbelief in the supernatural made him a skeptic.
超自然に対する彼の不信は彼を懐疑的にしました。
B1 adjective /ˈjuːnɪfɔːrm/

Uniform

制服
Meaning
consistent; identical; standardized
Example
All students must wear a uniform to school.
すべての学生は学校で制服を着なければなりません。
B2 adjective /ʌnˈwaɪz/

unwise

賢明でない
Meaning
Showing poor judgment; not sensible or prudent.
Example
It would be unwise to invest all your money in one company.
すべてのお金を1つの会社に投資するのは賢明でないことです。
B2 adjective /ˌʌndɪˈsaɪdɪd/

Undecided

未決定; 不確実
Meaning
not having made a decision; uncertain
Example
She was undecided about which college to attend.
彼女はどの大学に進学するか決めかねていた。
B2 adjective /ˌʌnrɪˈlaɪəbl/

Unreliable

信頼できない; 信頼や依存ができない
Meaning
not dependable; not able to be trusted or relied upon
Example
The old car is unreliable and breaks down frequently.
その古い車は信頼できず、よく壊れます。
C2 verb /ʌnˈfɛtər/

unfetter

制約から解放する
Meaning
to release from restraint or restriction; to free
Example
The new law will unfetter small businesses from excessive regulations.
新しい法律は小規模なビジネスを過剰な規制から解放します。
B2 noun /ˈʌndərkləʊðz/

underclothes

下着
Meaning
Clothing worn beneath outer clothes, such as underwear or lingerie
Example
He folded his underclothes neatly before packing them.
彼は下着を丁寧にたたんでから詰めた。
C1 adjective /ʌnˈkæni/

uncanny

不気味
Meaning
Strange or mysterious, especially in an unsettling way.
Example
She has an uncanny ability to predict the future.
彼女は未来を予測する不気味な能力を持っている。
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 /ˌʌnɪˈmædʒənəbəl/

Unimaginable

想像を絶する
Meaning
impossible to conceive; beyond imagination
Example
The scale of destruction was unimaginable until we saw it firsthand.
破壊の規模は想像を絶するもので、私たちはそれを目の当たりにするまでわかりませんでした。
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。
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 adjective /ʌn.rɪˈleɪ.tɪd/

Unrelated

無関係な; 関連していない
Meaning
having no connection or relationship; not connected by family ties
Example
The two incidents were completely unrelated to each other.
二つの出来事は完全に無関係だった。
A2 noun /ʌmˈbrɛlə/

umbrella

傘
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.
雨が降り始めたので、彼女は傘を開いた。
C1 noun /ˈʌndərdɒɡ/

underdog

アンダードッグ
Meaning
a competitor thought to have little chance of winning; a weaker party in a contest
Example
The underdog team surprised everyone by winning the championship.
アンダードッグのチームはチャンピオンシップを勝ち取って、皆を驚かせました。
C2 verb /ʌpˈbreɪd/

upbraid

叱る
Meaning
To scold or criticize someone harshly.
Example
The teacher upbraided the student for being late again.
教師は学生がまた遅刻したことを叱りました。
C1 adjective /ʌnˈruːli/

Unruly

無秩序な; 不従順な;
Meaning
difficult to control or manage; disorderly and disruptive
Example
The unruly crowd refused to follow the safety instructions.
無秩序な群衆は安全指示に従うことを拒否した。
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。
B1 adjective /ʌnˈedjʊkeɪtɪd/

Uneducated

未教育; 教育を受けていない
Meaning
lacking education; not having received formal schooling or training
Example
Many uneducated workers struggle to find well-paying jobs.
多くの未教育の労働者は、良い給料の仕事を見つけるのに苦労しています。
B1 noun /ˌʌnɪmˈplɔɪmənt/

Unemployment

失業
Meaning
the state of being unemployed; lack of paid work
Example
The unemployment rate has increased significantly this year.
今年の失業率は大幅に増加しました。
B2 adjective /ʌnˈtʃeɪndʒəbəl/

Unchangeable

変更不可能な; 固定された;
Meaning
not able to be changed or altered; fixed and permanent
Example
The laws of physics are unchangeable principles that govern the universe.
物理法則は変更不可能な原則であり、宇宙を支配しています。
B1 verb /juˈnaɪt/

unite

団結する
Meaning
to join together or combine; to bring people or things together
Example
The crisis helped unite the community.
危機はコミュニティを団結させる手助けをした。
B2 verb /ʌnˈtaɪ/

untie

解く
Meaning
to loosen or remove a knot or binding; to release something that is tied
Example
She untied the rope to free the boat.
彼女は船を自由にするためにロープを解いた。
B1 noun /ˈjuːnjən/

Union

連合
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.
二つの企業の連携が強力な企業を作り出しました。
B2 adjective /ˌʌnˈnoʊ.tɪst/

Unnoticed

気づかれなかった; 無視された
Meaning
not seen or observed; ignored
Example
His hard work went unnoticed by his manager.
彼の努力はマネージャーに気づかれませんでした。
B2 adjective /ʌnˈfeɪv(ə)rəbəl/

unfavorable

不利な
Meaning
not beneficial or advantageous; showing disapproval or opposition
Example
The proposal received an unfavorable response from the committee.
その提案は委員会から不利な反応を受けました。
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。
C1 adjective /ˌʌnrɪˈkwaɪtɪd/

unrequited

Meaning
Not returned or reciprocated, especially in the context of love or affection.
Example
He suffered from unrequited love for years.
C1 noun /ˈʌndərˌɡɑːrmənt/

undergarment

下着
Meaning
a piece of clothing worn under outer clothes, usually next to the skin
Example
He bought new undergarments for the wedding.
彼は結婚式のために新しい下着を買いました。
C2 verb /ˌʌndərˈɡɜːrd/

undergird

支える、強化する
Meaning
to provide support or foundation for; to strengthen
Example
Strong values undergird a healthy society.
強い価値観は健康な社会を支えています。
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 /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。
B1 adjective /ˌʌnɪkˈspektɪd/

Unexpected

予想外の; 驚くべき
Meaning
not expected or anticipated; surprising
Example
The unexpected news left everyone speechless.
予想外のニュースは、皆を言葉を失わせた。
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。
B2 adverb /ʌnˈfɛərli/

unfairly

不公平に
Meaning
In a manner that is not just, reasonable, or impartial
Example
He was treated unfairly by the committee.
彼は委員会によって不公平に扱われた。
B2 adjective /ʌnprəˈdʌk.tɪv/

Unproductive

非生産的; 効率が悪い
Meaning
not achieving much; not producing good results
Example
The meeting was unproductive and wasted everyone's time.
会議は非生産的で、全員の時間を無駄にしました。
B2 adjective /ʌnˈkwɒl.ɪ.faɪd/

Unqualified

資格がない; 経験不足の;
Meaning
not having the necessary skills or qualifications; complete or absolute
Example
He was unqualified for the engineering position due to lack of experience.
彼は経験不足でエンジニアの職に不適格でした。
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。
B2 noun ˌɜːbənaɪˈzeɪʃən

urbanization

都市化
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.
都市化はより発展したインフラストラクチャーをもたらす。
C2 noun /ˈʌp.wel.ɪŋ/

upwelling

湧昇流
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.
湧昇流は海面へ栄養分を運ぶ。