C2 verb /ʌnˈkaʊtʃ/

uncouch

从沙发上移开（罕见用法）

Meaning

to remove from a couch or to release from being laid down (rare/archaic usage)

Example

The surgeon attempted to uncouch the cataract.

外科医生试图去除白内障。

B2 verb ˈjuːnɪfaɪ

unify

统一

Meaning

To make or become united, uniform, or whole; to bring together into a single unit.

Example

Adolescents unify with peers for social acceptance.

青少年为了社会接纳与同伴统一。

C2 noun /ˈʌmbrɪdʒ/

umbrage

冒犯，愤怒

Meaning

A feeling of resentment or offense.

Example

She took umbrage at his rude remark.

她对他的粗鲁言论感到愤怒。

C1 adjective /ʌnˈsɪvəlaɪzd/

Uncivilized

未开化的; 野蛮的;

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.

探险者在亚马逊雨林深处遇到一个未开化的部落。

B2 adjective /ʌnˈlɪmɪtɪd/

unlimited

无限

Meaning

without any limits or restrictions

Example

The internet plan offers unlimited data for the whole month.

该互联网计划提供整个一个月的无限数据。

B2 adjective /ʌnˈwɜːrði/

Unworthy

不配; 没有价值

Meaning

not deserving respect or attention; lacking worth or merit

Example

He felt unworthy of such praise and recognition.

他觉得自己不配得到这样的赞扬和认可。

B2 adjective /ʌnˈbiːtən/

Unbeaten

不败的; 未被击败的

Meaning

not defeated; having never lost; undefeated

Example

The team remains unbeaten this season.

这个团队本赛季保持不败。

B2 noun /ʌnˈrest/

Unrest

不安；动荡；社会或政治动乱

Meaning

a state of dissatisfaction and disturbance; social or political disorder

Example

The economic crisis led to widespread social unrest.

经济危机导致了广泛的社会不安。

C1 noun /ˈʌp.ʃɒt/

Upshot

结果; 结论

Meaning

the final result or outcome of a series of events; conclusion

Example

The upshot of the meeting was a decision to postpone the project.

会议的结果是决定推迟项目。

C2 adjective /ˌʌltrəˈmʌndeɪn/

ultramundane

超凡

Meaning

Relating to things beyond the physical world; supernatural or transcendental.

Example

Philosophers often discuss ultramundane realities beyond human perception.

哲学家们常常讨论超越人类感知的超凡现实。

A2 adjective /ˈʌɡ.li/

Ugly

丑陋的; 可憎的; 可怕的

Meaning

unpleasant or repulsive in appearance; morally reprehensible

Example

The old building looked ugly after years of neglect.

这座老建筑在多年疏忽之后看起来很丑。

B2 adjective /ʌnˈɑːrmd/

unarmed

手无寸铁

Meaning

Not equipped with or carrying weapons

Example

The police found the suspect unarmed during the search.

警察在搜查过程中发现嫌疑人没有武器。

C2 adjective /ˈʌndjʊleɪtɪŋ/

undulating

波动的

Meaning

Having a smoothly rising and falling form or motion like waves.

Example

We drove through undulating hills.

我们驱车穿过起伏的山丘。

B2 noun /ˈɜː.dʒən.si/

Urgency

紧急

Meaning

the quality of requiring immediate action or attention; pressing importance

Example

The urgency of the situation required immediate medical attention.

情况的紧急性要求立即的医疗关注。

C1 noun /juːˈtoʊpiə/

utopia

乌托邦

Meaning

An imagined perfect society or place where everything is ideal.

Example

Many philosophers dreamed of creating a utopia for humanity.

许多哲学家梦想着为人类创造一个乌托邦。

B1 adjective /ʌnˈfrɛndli/

unfriendly

不友好的

Meaning

not kind or welcoming; hostile or cold in behavior or attitude

Example

The shop owner seemed unfriendly to new customers.

店主对新顾客显得不友好。

C1 adverb /ʌnˈnætʃrəli/

unnaturally

不自然地

Meaning

in a way that is not natural or normal; excessively or strangely

Example

He smiled unnaturally, making everyone feel uncomfortable.

他不自然地笑了，让每个人都感到不舒服。

B2 adverb /ʌnˈkɒnʃəsli/

unconsciously

无意识地

Meaning

without being aware of one's actions or surroundings

Example

She unconsciously tapped her foot to the rhythm of the music.

她无意识地跟着音乐的节奏轻轻跺脚。

B1 noun /ˈjuːnjən/

Union

联合

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.

两家公司的联合创造了一个强大的公司。

B1 adjective /ˌʌnˈpeɪd/

Unpaid

未支付的; 无薪的

Meaning

not paid for; without payment or salary

Example

She worked as an unpaid intern for six months.

她作为一名无薪实习生工作了六个月。

B1 verb /ˈʌpˌɡreɪd/

upgrade

升级

Meaning

to raise something to a higher standard, improve

Example

We decided to upgrade the software to the latest version.

我们决定将软件升级到最新版本。

B2 adjective /ʌnˈlɔːfl/

Unlawful

非法; 不合法

Meaning

not authorized by law; illegal

Example

The court declared the search unlawful.

法院宣布搜索是非法的。

B2 verb /ʌnˈveɪl/

unveil

揭示

Meaning

to reveal or disclose something, especially in a formal manner

Example

The company will unveil a new product next week.

公司将在下周揭示一款新产品。

C2 adjective /ʌnˈkɒnʃənəbl/

unconscionable

不合理的

Meaning

shockingly unfair or unreasonable

Example

The company made unconscionable profits from the crisis.

公司从危机中获得了不合理的利润。

B2 adverb /ʌnˈkaɪndli/

unkindly

残忍地

Meaning

in a cruel, harsh, or unsympathetic manner

Example

She spoke unkindly about her colleague during the meeting.

她在会议期间残忍地谈论了她的同事。

C1 adjective /ʌnˈɒnəd/

unhonoured

未受尊敬的

Meaning

not respected or given the recognition that is deserved; treated without honor

Example

He felt unhonoured after his years of service were ignored.

他的多年服务被忽视后，他感到自己未受尊敬。

C1 adjective /ʌnˈtaɪərɪŋ/

Untiring

不知疲倦的; 坚持不懈的; 永不止步的

Meaning

continuing without stopping; persistent; tireless

Example

Her untiring efforts finally led to success.

她的不知疲倦的努力最终带来了成功。

C2 adjective /ʌnˈwəʊntɪd/

unwonted

不寻常

Meaning

Unusual, uncommon, or out of the ordinary.

Example

She spoke with an unwonted gentleness that surprised everyone.

她以一种不寻常的温柔说话，令所有人都感到惊讶。

B2 verb /ˌʌndərˈɡoʊ/

undergo

经历

Meaning

to go through something, especially something unpleasant or difficult

Example

She had to undergo surgery to recover.

她不得不接受手术以恢复。

C2 verb /ʌpˈhiːv/

upheave

抬起

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.

工人们不得不抬起重石来清理道路。

B1 adjective /ʌnˈʃʊr/

unsure

不确定的

Meaning

not certain or confident; feeling doubt

Example

She felt unsure about the decision.

她对这个决定感到不确定。

C2 adjective /ˌʌltrəˈmɒnteɪn/

ultramontane

教皇支持者

Meaning

beyond the mountains, especially referring to support for the Pope over local church authority

Example

The debate highlighted the ultramontane position in church politics.

辩论突出了教会政治中超山的立场。

C1 noun /ʌnkənˈsɜːrn/

Unconcern

漠不关心

Meaning

lack of worry or interest; indifference

Example

She showed complete unconcern about the criticism.

她对批评表现出了完全的漠不关心。

B2 adjective /ʌnˈtʃeɪndʒəbəl/

Unchangeable

不可改变的; 固定的;

Meaning

not able to be changed or altered; fixed and permanent

Example

The laws of physics are unchangeable principles that govern the universe.

物理法则是不变的原则，支配着宇宙。

C1 noun /ˈʌndərˌteɪkər/

undertaker

殡葬员

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.

殡葬员为葬礼服务准备了尸体。

C1 adjective ˌʌn.pəˈtɜːbd

unperturbed

不为某事烦恼或困扰；冷静且镇定

Meaning

Not worried or disturbed by something; calm and composed.

Example

She remained unperturbed despite the challenges.

尽管有挑战，她依然保持冷静。

B2 adjective /ˌʌnɪnˈfɔːrmd/

uninformed

不了解情况的

Meaning

lacking knowledge or awareness about a particular subject; not educated or informed

Example

The decision was made by an uninformed committee.

这个决定是由一个不了解情况的委员会做出的。

C1 noun /ˈʌndərdɒɡ/

underdog

逆袭者

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.

逆袭者队伍通过赢得锦标赛让所有人都惊讶。

C1 adjective /ˌʌndərˈsteɪtɪd/

understated

低调的

Meaning

Presented in a subtle and restrained way.

Example

She wore an elegant but understated dress.

她穿了一件优雅但低调的裙子。

B1 adjective /juːˈnaɪtɪd/

United

联合的; 一致的; 团结的

Meaning

joined together for a common purpose; in agreement

Example

The team was united in their goal to win.

团队在他们的目标上达成了统一。

C1 adjective /ˌʌnprɪˈtɛnʃəs/

unpretentious

谦虚的

Meaning

modest; not attempting to impress others with appearance or importance

Example

She lives in an unpretentious home but is very happy.

她住在一个谦虚的家里，但非常快乐。

C2 adjective /ˌʌnɪmˈpiːtʃəbl/

unimpeachable

无可指摘

Meaning

Not able to be doubted, questioned, or criticized; completely trustworthy.

Example

She is known for her unimpeachable honesty.

她因其无可指摘的诚实而闻名。

B2 adjective ʌnˈprɛsɪˌdɛntɪd

unprecedented

前所未有

Meaning

Never done or known before; without previous example.

Example

Unprecedented advancements in science changed human lives.

科学上的前所未有的进展改变了人类的生活。

B2 verb /ˌʌndərˈmaɪn/

undermine

削弱

Meaning

to gradually weaken or damage something or someone

Example

Constant criticism can undermine a child's confidence.

持续的批评可能会削弱孩子的自信心。

B2 adjective /ʌnˈdʒʌst/

Unjust

不公正的; 错误的

Meaning

not fair or right; morally wrong

Example

The punishment was unjust for such a minor offense.

这个惩罚对于如此轻微的罪行来说是不公正的。

B2 adverb /ˈʌt.ə.li/

Utterly

完全地; 绝对地; 完整地

Meaning

completely; absolutely; totally

Example

The movie was utterly boring and I fell asleep.

电影完全无聊，我睡着了。

C1 adjective /ʌnˈkɛmpt/

unkempt

邋遢

Meaning

Having an untidy or disheveled appearance.

Example

He looked unkempt after sleeping outdoors all night.

他睡了一整晚露天后，看起来邋遢。

A1 adjective /ˈjuːs.fəl/

Useful

有用的; 实用的

Meaning

having a beneficial purpose; practical

Example

This tool is very useful for fixing problems.

这个工具对解决问题非常有用。

A2 adjective /ʌnˈtaɪdi/

Untidy

凌乱的; 无序的;

Meaning

not neat or orderly; messy and disorganized

Example

Her untidy room was filled with clothes scattered everywhere.

她凌乱的房间充满了四处散落的衣服。

B2 adjective /ʌnprɪˈpɛrd/

Unprepared

未准备好

Meaning

not ready or able to deal with something

Example

He was unprepared for the difficult exam.

他对困难的考试毫无准备。

B1 adjective /ʌnˈtru/

Untrue

错误的; 不正确的

Meaning

not true; false; incorrect

Example

His statement about the incident was completely untrue.

他关于事件的陈述完全是错误的。

C2 adjective /ˌʌn.təˈwɔːrd/

untoward

意外的

Meaning

Unexpected and inappropriate or inconvenient.

Example

The meeting ended without any untoward incidents.

会议在没有任何意外事件的情况下结束。

C2 noun /ʌnˈkloʊðɪŋ/

unclothing

脱衣

Meaning

the act or process of removing clothing

Example

The child quickly ran inside for unclothing after playing in the mud.

孩子在泥地玩耍后迅速跑进去脱衣。

B2 adjective /ʌnˈkwɒl.ɪ.faɪd/

Unqualified

不合格的; 无资格的;

Meaning

not having the necessary skills or qualifications; complete or absolute

Example

He was unqualified for the engineering position due to lack of experience.

他因缺乏经验而不适合这个工程职位。

B2 adjective /ʌnəˈfreɪd/

unafraid

无畏

Meaning

Not feeling fear; brave or courageous

Example

She walked into the dark room, unafraid of what might be inside.

她走进黑暗的房间，无畏里面可能有什么。

C1 adjective /ˌʌnəˈdɔːrnd/

unadorned

简单的，未装饰的

Meaning

Plain and simple; not decorated.

Example

The room was unadorned, with only a table and a chair.

房间简单，只有一张桌子和一把椅子。

B2 adjective /ˈʌpˌraɪt/

Upright

诚实且道德正确；垂直或挺立的姿势

Meaning

honest and morally correct; vertical or erect in position

Example

She is known for being an upright and honest businesswoman.

她以诚实和正直的商业女性而闻名。

C1 adjective /ˌʌnˈɪntɪmeɪtɪŋ/

unintimating

没有暗示

Meaning

Not giving a hint or suggestion; not indicating.

Example

His unintimating tone gave no clue of his true feelings.

他的没有暗示的语气没有透露他真正的感受。

A1 adjective /juːzd/

used

二手

Meaning

having already been used

Example

This is a used car.

这是一辆二手车。

C1 verb /ʌpˈruːt/

uproot

拔除

Meaning

To pull something out of the ground; to remove or displace completely.

Example

They uprooted the old tree from the garden.

他们从花园里把老树拔了出来。

C2 adjective /ʌpˈrɔːr.i.əs/

uproarious

极其滑稽

Meaning

Extremely funny or noisy; causing loud laughter or commotion.

Example

The comedian's jokes were absolutely uproarious.

喜剧演员的笑话绝对是极其滑稽的。

C1 adjective /ʌnˈkuːθ/

uncouth

粗鲁

Meaning

Lacking good manners, refinement, or grace; awkward or rough.

Example

His uncouth behavior shocked the guests at the party.

他粗鲁的行为让聚会上的客人感到震惊。

B2 adjective /ˌʌndɪˈstɜːrbd/

Undisturbed

未打扰

Meaning

not interrupted or interfered with; calm and peaceful

Example

She slept undisturbed for eight hours.

她睡了八个小时没有打扰。

C1 noun /ˌjuːnɪˈfɔːrməti/

Uniformity

一致性；统一性；相同状态

Meaning

the quality of being uniform; consistency or sameness

Example

The uniformity of the design created a pleasing visual effect.

设计的一致性创造了一个吸引人的视觉效果。

C2 noun/verb /ˈʌpˌkæst/

upcast

向上投掷

Meaning

Verb: To cast or throw upward. Noun: Something thrown or directed upward.

Example

The fisherman upcast his net into the air.

渔夫把他的网投向空中。

A2 verb /ʌpˈdeɪt/

update

更新

Meaning

to make something more modern or current; to provide new information

Example

Please update your software regularly.

请定期更新您的软件。

B2 verb /ʌnˈkʌvə(r)/

uncover

揭示

Meaning

to reveal something that was hidden or secret

Example

The investigation uncovered new evidence.

调查揭示了新的证据。

C2 adjective /ʌnˈtiːtʃəbəl/

unteachable

不可教的

Meaning

not able or willing to learn; resistant to instruction or guidance

Example

He was so stubborn that he became almost unteachable.

他非常固执，几乎变得不可教。

B2 adjective /ʌnˈwɪl.ɪŋ/

Unwilling

不愿意的; 不情愿的;

Meaning

not ready to do something; reluctant; not wanting to do

Example

He was unwilling to share his secret with anyone.

他不愿意与任何人分享他的秘密。

B2 adjective /ˌʌnkənˈtroʊld/

uncontrolled

无法控制的

Meaning

not restrained or managed; lacking control

Example

The wildfire spread in an uncontrolled manner, causing widespread damage.

野火以无法控制的方式蔓延，造成广泛破坏。

B1 adverb /ˌʌpsaɪd ˈdaʊn/

Upside-down

倒过来

Meaning

with the upper part at the bottom; in or into a reversed position

Example

The picture was hanging upside-down on the wall.

图片倒挂在墙上。

C1 verb /ˌʌndərˈlaɪ/

underlie

位于...之下

Meaning

to be the hidden cause or basis of something

Example

Strong cultural traditions underlie the community's practices.

强大的文化传统是社区实践的基础。

C1 adjective ʌnˈpær.ə.leld

Unparalleled

无与伦比

Meaning

Having no equal; unmatched, peerless, and supreme in quality or achievement.

Example

The unparalleled beauty of the Taj Mahal amazes visitors.

泰姬陵无与伦比的美丽使游客惊叹。

B2 adjective /ˌʌn.kəʊˈɒp.ər.ə.tɪv/

uncooperative

不合作的

Meaning

not willing to help or work with others; unhelpful

Example

The witness was uncooperative and refused to answer questions.

证人不合作，拒绝回答问题。

B2 adjective /ˌʌnkənˈvɪnsɪŋ/

Unconvincing

不可信

Meaning

failing to persuade or impress; not believable or credible

Example

His excuse for being late was completely unconvincing.

他因迟到而给出的借口完全不可信。

C2 noun /ˈʌn.dɚˌstɔː.ri/

understory

下层植被

Meaning

The layer of vegetation beneath the main canopy of a forest.

Example

The understory of a rainforest is home to small mammals and insects.

雨林的下层植被是小型哺乳动物和昆虫的家园。

C2 noun juːˈbɪkwɪti

ubiquity

普遍性

Meaning

The fact of appearing everywhere or of being very common.

Example

The ubiquity of smartphones has transformed communication.

智能手机的普遍性改变了通信方式。

B2 verb /ʌpˈhoʊld/

uphold

维护

Meaning

to maintain or support a principle, law, or decision

Example

The judge promised to uphold justice at all costs.

法官承诺不惜一切代价维护正义。

B2 adjective /ʌnˈdɪvaɪdɪd/

Undivided

完整的; 完全的; 不分开或不分裂

Meaning

whole; complete; not separated or split

Example

The team showed undivided attention to the coach's instructions.

团队对教练的指示表现出了完整的注意力。

Meaning

To undo twisted or knitted threads; to solve or explain something complicated.

Example

The detective worked hard to unravel the mystery.

B2 adjective /juːˈnæn.ɪ.məs/

Unanimous

一致的

Meaning

fully in agreement; shared by all

Example

The committee reached a unanimous decision.

委员会达成了一致的决定。

C1 adjective /ʌnˈʃeɪkən/

Unshaken

坚定不移; 坚固

Meaning

not disturbed or affected; firm and steady; unwavering

Example

Her faith remained unshaken despite all the challenges.

尽管面临所有挑战，她的信念依然坚定不移。

B2 noun ˈjuːnəti

unity

团结

Meaning

The state of being united or joined as a whole.

Example

Unity among people led to victory.

人们之间的团结带来了胜利。

C1 adjective ʌnˈtʃɑːtɪd

uncharted

未标记

Meaning

Not mapped or surveyed; unknown or unexplored.

Example

The mission aimed to explore uncharted areas of the planet.

该任务旨在探索星球上未标记的区域。

C2 adjective /ʌnˈælɔɪd/

unalloyed

纯净

Meaning

Pure, complete, and not mixed with anything else.

Example

She felt unalloyed joy at the news of her success.

她听到成功的消息时感到纯粹的喜悦。

C2 adjective /ʌnˈflæpəbəl/

unflappable

冷静沉着

Meaning

calm and composed, especially in difficult situations

Example

Despite the crisis, he remained unflappable and confident.

尽管面临危机，他依然保持冷静沉着，充满自信。

B1 adjective /ˌʌnɪmˈpɔːrtənt/

unimportant

不重要的

Meaning

not having much value, significance, or influence

Example

The detail seemed unimportant compared to the main issue.

与主要问题相比，这个细节显得不重要。

B2 adjective /ʌnˈprɒf.ɪ.tə.bl̩/

Unprofitable

无利可图

Meaning

not yielding profit or gain; not producing financial benefit

Example

The unprofitable business was forced to close down after three years.

这个无利可图的生意在三年后被迫关闭。

B2 adjective /ʌnˈsuːtəbl/

Unsuitable

不适合; 不合适

Meaning

not fitting or appropriate for a particular purpose or situation

Example

This formal dress is unsuitable for a casual beach party.

这件正式的衣服不适合参加随意的海滩派对。

C2 noun /ɜːrˈbænɪti/

urbanity

都市气质

Meaning

refined courtesy, elegance, and sophistication in manner

Example

Her urbanity made her popular among diplomats and leaders.

她的都市气质让她在外交官和领导人中非常受欢迎。

C2 adjective /ʌnəˈpiːzd/

unappeased

不平息的

Meaning

Not satisfied or calmed; still feeling discontent or anger

Example

Despite the apology, she remained unappeased.

尽管道歉，她仍然不平息的。

B2 adjective /ˈʌl.tɪ.mət/

Ultimate

最终的; 极致的; 终极的

Meaning

being the best or most extreme example of its kind; final; last

Example

This is the ultimate test of your skills.

这是你技能的终极考验。

B2 adjective /ˌʌnprɪˈdɪktəbəl/

unpredictable

不可预测的

Meaning

not able to be predicted; changing suddenly and unexpectedly

Example

The weather in this region is highly unpredictable.

这个地区的天气非常不可预测。

未缓解

Meaning

Not made less intense or relieved; unrelieved.

Example

His grief remained unassuaged despite the passage of time.

他的痛苦尽管时间流逝依然未缓解。