B2 adjective /ˌʌndɪˈnaɪəbl/

Undeniable

不容置疑

Meaning

impossible to deny or dispute; clearly true

Example

The evidence of his guilt was undeniable.

他的罪行证据是不容置疑的。

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 adverb /ˌʌnkənˈvɛnʃənəli/

unconventionally

非传统地

Meaning

in a way that is not based on or conforming to accepted standards or norms

Example

She dresses unconventionally, mixing bold colors and patterns that surprise everyone.

她穿着非传统地，混搭大胆的颜色和图案，让每个人都感到惊讶。

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 adjective /ʌnˈriːzənəbəl/

unreasonable

不合理的

Meaning

not guided by reason or fairness; excessive or extreme beyond what is acceptable

Example

The manager made an unreasonable demand that no one could realistically meet.

经理提出了一个不合理的要求。

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 adjective /ˈʌndjʊləs/

undulous

波浪形的

Meaning

Having a wavy surface or form.

Example

The artist painted the undulous sea at sunset.

艺术家在日落时画了波浪形的海洋。

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。

B2 noun /juːˈtɪl.ə.ti/

Utility

效用; 益处; 公共服务

Meaning

the state of being useful, profitable, or beneficial; a public service

Example

The utility of solar panels increases with rising electricity costs.

随着电费上涨，太阳能板的效用也在增加。

B2 adjective /ʌnˈθɪŋkəbl/

Unthinkable

难以想象的

Meaning

impossible to conceive or imagine; beyond belief or consideration

Example

It was unthinkable that such a tragedy could happen in our peaceful town.

在我们和平的小镇上发生这样一场悲剧，简直是难以想象的。

C2 adjective /juːˈʒʊəriəs/

usurious

高利贷的

Meaning

Charging excessively high interest rates on loans.

Example

The bank was accused of offering loans at usurious rates.

该银行被指控以高利贷利率提供贷款。

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。

C1 verb /ʌnˈɜːθ/

unearth

发掘

Meaning

To dig up from the ground or to discover something hidden.

Example

Archaeologists unearthed ancient artifacts at the site.

考古学家在遗址发掘了古代文物。

B1 adjective /ʌnˈklɪər/

unclear

不清楚

Meaning

not easy to understand; vague or ambiguous

Example

The instructions were unclear, so I asked for clarification.

说明不清楚，所以我要求澄清。

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。

B1 adjective /ʌnˈnoʊn/

Unknown

未知

Meaning

not known or identified; unfamiliar

Example

The author of this letter remains unknown.

这封信的作者仍然未知。

A2 noun /ˌʌndərˈstændɪŋ/

understanding

理解

Meaning

the ability to grasp the meaning, significance, or nature of something

Example

Her understanding of the issue was impressive.

她对这个问题的理解令人印象深刻。

B2 adjective /ˈʌt.moʊst/

Utmost

最极; 极限

Meaning

greatest; most extreme; maximum possible

Example

She showed utmost care while handling the fragile items.

她在处理脆弱物品时表现出最大的关心。

C1 adjective /ʌnˈsɪvəl/

Uncivil

不文明的; 粗鲁的;

Meaning

not polite or courteous; rude and discourteous in behavior

Example

His uncivil remarks during the meeting offended everyone present.

他在会议上的不文明言论冒犯了在场的每一个人。

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。

B1 preposition, adverb, adjective /ˌʌndərˈniːθ/

underneath

在……下面

Meaning

Located directly below or beneath something

Example

The keys were hidden underneath the pile of papers.

钥匙被隐藏在那堆文件下面。

B2 adjective /ʌnhaɪˈdʒiːnɪk/

Unhygienic

不卫生的；缺乏适当的卫生

Meaning

not clean; lacking proper sanitation

Example

The restaurant was closed due to unhygienic conditions in the kitchen.

由于厨房不卫生的条件，餐厅被关闭。

C1 adjective /ʌnˈsiːmli/

unseemly

不得体

Meaning

Not proper or appropriate in behavior or appearance; unbecoming.

Example

His unseemly remarks embarrassed everyone at the dinner table.

他不得体的言论让晚餐桌上的每个人都感到尴尬。

B2 adjective /ˈʌpˌhɪl/

Uphill

困难的; 需要巨大努力的; 向上的倾斜

Meaning

difficult; requiring great effort; sloping upward

Example

Learning a new language can be an uphill battle.

学习一门新语言可能是一个艰难的战斗。

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。

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 /ˌʌnɪmˈplɔɪəbəl/

unemployable

不适合就业

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.

由于他的犯罪记录，他在大多数公司被认为是不适合就业。

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。

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。

C2 adjective /ˌʌnrɪˈmɪtɪŋ/

unremitting

不断的

Meaning

Never relaxing or stopping; persistent.

Example

Her unremitting efforts finally paid off.

她不懈的努力终于得到了回报。

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。

B1 noun /juːˈten.səlz/

Utensils

餐具

Meaning

tools or implements used for cooking, eating, or serving food

Example

Please wash all the cooking utensils after preparing dinner.

请在准备晚餐后清洗所有的厨房用具。

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.

森林中充满了超自然的光辉。

C1 adjective /ˌʌnfɔːrθˈkʌmɪŋ/

unforthcoming

不合作的

Meaning

Not willing to talk or provide information; uncooperative.

Example

The witness was unforthcoming about what he had seen.

证人对于他所见的情况不合作。

B2 adjective /ʌnfəˈmɪl.jər/

Unfamiliar

不熟悉的; 陌生的

Meaning

not known or recognized; strange

Example

The city was unfamiliar to me since I had never been there before.

这座城市对我来说很陌生，因为我以前从未去过那里。

C1 noun /ˌʌnbɪˈliːf/

Unbelief

不信

Meaning

lack of religious belief; skepticism or doubt

Example

His unbelief in the supernatural made him a skeptic.

他对超自然的怀疑使他成为了一个怀疑者。

C2 adjective /ʌnˈfeɪnd/

unfeigned

真诚

Meaning

genuine; not pretended or insincere

Example

She expressed unfeigned joy at her friend's success.

她在朋友的成功上表达了真诚的喜悦。

C1 adjective /ˌʌn.əˈdʌl.tə.reɪ.tɪd/

Unadulterated

纯净的

Meaning

not mixed or diluted with any different or extra elements; pure

Example

She felt unadulterated joy when she heard the news.

当她听到这个消息时，她感到纯净的快乐。

B1 adjective /ʌnˈwel/

Unwell

不舒服; 生病

Meaning

not in good health; feeling sick or ill

Example

She has been feeling unwell since yesterday.

她从昨天开始感到不舒服。

C2 adjective /ʌnˈwiːldi/

unwieldy

笨重

Meaning

Difficult to carry or move because of its size, shape, or weight.

Example

The box was too unwieldy to carry up the stairs.

这个盒子太笨重了，无法把它提上楼梯。

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。

B1 adjective /ˌʌnsəkˈsesfl/

Unsuccessful

失败的; 没有成功的;

Meaning

not achieving desired aims or results; failing to accomplish a purpose

Example

His unsuccessful attempt to climb the mountain left him disappointed.

他未能成功登上山顶，感到失望。

C1 verb /ʌnˈnɜːrv/

unnerve

失去信心

Meaning

to make someone lose confidence, courage, or composure

Example

The hostile questions began to unnerve the witness.

敌对问题开始让证人感到不安。

C1 noun /ʌnˈfeɪθfʊlnəs/

unfaithfulness

不忠

Meaning

the quality of being disloyal or not faithful; breach of trust or fidelity

Example

His unfaithfulness led to the end of their marriage.

他的不忠导致了他们婚姻的结束。

B2 adjective /ˌʌnəˈweər/

Unaware

无意识的; 不知道的; 没有意识

Meaning

not knowing or realizing; having no knowledge of something

Example

She was completely unaware of the danger.

她完全没有意识到危险。

C1 adjective /ˌʌndərˈsaɪzd/

undersized

尺寸过小

Meaning

Smaller than the usual or expected size.

Example

The undersized puppy struggled to keep up with its siblings.

这只尺寸过小的小狗很难跟上它的兄弟姐妹。

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.

该公司在上个季度销售情况有所改善。

B2 verb /ɜːrdʒ/

urge

催促

Meaning

to strongly encourage or try to persuade someone to do something

Example

Doctors urge patients to exercise regularly.

医生鼓励病人定期锻炼。

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。

B2 adjective /ʌnˈstɛdi/

unsteady

不稳定的

Meaning

not firm or stable; likely to change or fail

Example

She felt unsteady on her feet after the long journey.

长途旅行后，她感到站立不稳。

B2 adverb /ʌnˈsɜːrtənli/

uncertainly

不确定地

Meaning

in a way that shows doubt or lack of certainty

Example

She glanced uncertainly at the complicated instructions.

她不确定地看着复杂的说明。

C2 verb /ʌnˈkloʊð/

unclothe

脱衣; 脱掉衣服

Meaning

to remove clothing from someone or something

Example

The nurse helped unclothe the patient for the examination.

护士帮助病人脱衣进行检查。

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。

C1 adjective /ʌnˈkæni/

uncanny

不可思议

Meaning

Strange or mysterious, especially in an unsettling way.

Example

She has an uncanny ability to predict the future.

她有一种不可思议的能力来预测未来。

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。

C2 verb /ʌnˈjoʊk/

unyoke

解开

Meaning

To release from a yoke or to free from restraint or obligation.

Example

The farmer unyoked the oxen after a long day of work.

农民在长时间工作后解开了牛的套索。

C2 verb /ʌnˈɑːrm/

unarm

解除武装

Meaning

to remove weapons from someone or to deprive of means of attack or defense

Example

The soldiers were ordered to unarm the prisoners.

士兵接到命令解除囚犯的武装。

A2 noun /ˈʌndərwɛr/

Under wear

内衣

Meaning

clothing worn under other clothes, next to the skin

Example

She bought new underwear from the department store.

她在百货商店买了新的内衣。

A2 verb /ʌpˈset/

upset

烦扰

Meaning

to make someone worried, sad, or angry; to disturb

Example

The bad news upset everyone.

坏消息 upset 每个人。

C1 noun /juːnəˈnɪməti/

Unanimity

一致性

Meaning

complete agreement among all members of a group

Example

The committee reached unanimity on the new policy.

委员会在新政策上达成了一致意见。

C2 adjective /ʌnˈʌtərəbl/

unutterable

难以言喻

Meaning

Too great, intense, or awful to be expressed or described in words.

Example

She was filled with unutterable joy at the news of her success.

她听到成功的消息时充满了难以形容的喜悦。

B1 adjective /ʌnˈkaɪnd/

Unkind

残忍; 不友好

Meaning

cruel; not nice or caring toward others

Example

It was unkind of him to make fun of her appearance.

他取笑她的外貌，真是太不友善了。

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。

C1 adjective /ʌnˈhoʊli/

Unholy

亵渎的; 罪恶的; 亵渎的

Meaning

wicked; sinful; profane

Example

The unholy alliance between the two companies caused public outrage.

这两家公司之间的不圣洁联盟引发了公众愤怒。

C2 adjective /ʌnˈtɛmpərd/

untempered

失控的

Meaning

not moderated or softened; lacking proper balance or control

Example

The untempered anger of the crowd caused chaos.

人群的失控愤怒引发了混乱。

C2 verb /ʌnˈfɛtər/

unfetter

解开束缚

Meaning

to release from restraint or restriction; to free

Example

The new law will unfetter small businesses from excessive regulations.

新法律将使小企业免于过多的规定。

C1 adjective /ʌnˈmænɪdʒəbəl/

Unmanageable

无法控制的; 失控

Meaning

difficult or impossible to control or handle

Example

The large class became unmanageable without proper supervision.

没有适当的监督，班级变得无法控制。

C1 adjective /ˌʌnəˈsjuːmɪŋ/

unassuming

谦虚

Meaning

Not pretentious or arrogant; modest.

Example

Despite his success, he remained unassuming and humble.

尽管他取得了成功，他仍然谦虚和谦逊。

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。

C1 verb /ˌʌndərˈvæljuː/

undervalue

低估

Meaning

To assign too low a value or importance to something or someone.

Example

She felt that her boss consistently undervalued her contributions.

她感觉到她的老板总是低估她的贡献。

A1 adverb /ʌp/

up

向上

Meaning

towards a higher position or level

Example

He climbed up the ladder quickly.

他迅速爬上了梯子。

A2 adjective /ʌnˈkʌmf.tə.bəl/

Uncomfortable

不舒服

Meaning

causing or feeling slight pain or physical discomfort; making someone feel embarrassed, awkward, or anxious

Example

The chair was so uncomfortable that I couldn't sit in it for more than ten minutes.

这个椅子太不舒服了，我坐在上面超过十分钟就坐不下来了。

C1 adjective /ʌnˈvaɪəbl/

unviable

不可行的

Meaning

Not capable of working successfully; not feasible or practical.

Example

The project was deemed unviable due to high costs.

由于高昂的成本，该项目被认为不可行。

C2 noun /ˈʌŋkʃən/

unction

涂抹

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.

牧师庄重地进行了神圣的涂抹仪式。

B2 adjective /ʌnˈtʃeɪndʒɪŋ/

unchanging

不变的

Meaning

remaining the same over time; not changing

Example

Her love for her family was unchanging throughout the years.

她对家人的爱多年来始终不变。

C1 adjective /ʌnˈtʌtʃəbəl/

Untouchable

不可触碰的; 无法批评或攻击

Meaning

not able to be touched or affected; beyond criticism or attack

Example

The CEO seemed untouchable despite the scandal.

即使有丑闻，首席执行官似乎仍然是不可触碰的。

B2 adjective /ʌnˈnætʃərəl/

Unnatural

不自然的

Meaning

not existing in nature; artificial; forced

Example

The actor's smile looked unnatural and forced.

演员的笑容看起来很不自然，很勉强。

B1 adjective /ʌnˈfɔːr.tʃən.ət/

Unfortunate

不幸的；遗憾的

Meaning

having bad luck; regrettable or unlucky

Example

It was unfortunate that the meeting was cancelled at the last minute.

很不幸的是，会议在最后一刻被取消了。

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。

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 adjective ʌnˈskruːpjʊləs

unscrupulous

不道德的

Meaning

Having or showing no moral principles; not honest or fair.

Example

Unscrupulous peers can lead adolescents to delinquency.

不道德的同龄人可能会导致青少年犯罪。

C1 adjective /ʌnˈseɪvəri/

unsavory

令人不快

Meaning

Disagreeable, unpleasant, or morally offensive.

Example

The politician was linked to an unsavory scandal.

那位政治家与一宗令人不快的丑闻有关。

B1 adjective /ʌnˈedjʊkeɪtɪd/

Uneducated

未受教育的; 文盲

Meaning

lacking education; not having received formal schooling or training

Example

Many uneducated workers struggle to find well-paying jobs.

许多未受教育的工人很难找到薪水高的工作。

B2 adjective /ˌʌndɪˈveləpt/

Undeveloped

未开发的; 未成熟的; 原始的

Meaning

not yet developed; immature or primitive

Example

The undeveloped land was later turned into a park.

未开发的土地后来被改建成了一个公园。

C1 adjective /ʌnˈkwaɪ.ət/

Unquiet

不安的; 焦虑的; 激动的

Meaning

restless; unable to remain still or quiet; anxious or troubled

Example

She spent an unquiet night worrying about the exam results.

她度过了一个不安的夜晚，担心考试结果。

C1 noun ˌʌndərˈprɪvəlɪdʒd ɡruːps

underprivileged groups

贫困群体

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.

贫困群体从社会倡议中受益。

C1 adjective ʌnɪnˈhæbɪtəbəl

uninhabitable

不可居住

Meaning

Not suitable or safe for people to live in.

Example

Rapid urbanization can make cities uninhabitable.

快速城市化可能使城市变得无法居住。

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。

C2 noun /ˈʌm.brə/

Umbra

完全的阴影，太阳黑子的黑暗中心

Meaning

the fully shaded inner region of a shadow cast by an opaque object; the dark center of a sunspot

Example

During the eclipse, we stood in the moon's umbra.

在日食期间，我们站在月亮的本影中。

C1 adjective /ˌʌnkɒnstɪˈtuːʃənəl/

Unconstitutional

违宪的

Meaning

not in accordance with a political constitution; violating constitutional principles

Example

The court declared the new law unconstitutional.

法院宣布这项新法律违宪。

前所未有的知识

Meaning

Information or understanding that has never been obtained or achieved before.

Example

Artemis will provide unprecedented knowledge about the solar system.

阿尔忏将提供关于太阳系的前所未有的知识。