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。

C2 adjective /ʌnˈtʃeɪst/

Unchaste

不道德的; 不纯洁的;

Meaning

not celibate; having engaged in sexual relations; lacking moral purity

Example

The conservative society considered her behavior unchaste and improper.

保守的社会认为她的行为不道德和不合适。

B2 noun /ˌʌnəˌveɪləˈbɪləti/

unavailability

不可用性

Meaning

The state of being not available or not accessible.

Example

The unavailability of the manager caused a delay in the project.

经理的不可用性导致了项目的延误。

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。

C2 noun /ˈʌndərlɪŋ/

underling

下属

Meaning

a person of low rank or importance; a subordinate

Example

The manager ordered his underlings to finish the task quickly.

经理命令他的下属快速完成任务。

B1 adjective /ˈɜːrdʒənt/

Urgent

紧急

Meaning

requiring immediate action or attention; pressing

Example

The patient needs urgent medical attention.

病人需要紧急医疗照顾。

C1 verb /ˌʌndərˈsɛl/

undersell

Meaning

to sell something at a lower price than competitors or to downplay the value of something

Example

The shop undersold its rivals by offering huge discounts.

C1 adjective /ʌnˈfɛtərd/

unfettered

不受限制的

Meaning

not restricted or confined; free

Example

The artist enjoyed unfettered freedom of expression.

艺术家享受了无限制的表达自由。

C2 noun /juːˌtɪlɪˈtɛəriənɪzəm/

utilitarianism

功利主义

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.

功利主义认为我们应该采取行动，以最大化整体幸福。

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。

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。

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。

B1 adverb /ʌnˈjuːʒuəli/

unusually

异常地

Meaning

in a way that is not typical or expected; to an uncommon degree

Example

It was unusually cold for this time of year.

对一年中的这个时候来说，天气异常寒冷。

B2 adjective /ˈjuː.nɪ.faɪd/

unified

统一

Meaning

Made into a whole or joined together.

Example

A unified approach fosters better outcomes.

统一的方法促进了更好的结果。

B2 noun /ʌnəˈbɪləti/

unability

无能

Meaning

the state of being unable to do something; incapacity

Example

His unability to solve the problem caused delays in the project.

他解决问题的无能导致了项目的延误。

B2 adjective /ʌn.rɪˈleɪ.tɪd/

Unrelated

无关的; 不相关

Meaning

having no connection or relationship; not connected by family ties

Example

The two incidents were completely unrelated to each other.

这两个事件完全无关。

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。

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 adverb /ʌnˈplɛzəntli/

unpleasantly

令人不快地

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.

下午房间里热得令人不快。

C2 adjective /ʌnˈmɪtɪɡeɪtɪd/

unmitigated

完全

Meaning

absolute; not lessened or moderated

Example

The meeting was an unmitigated disaster.

会议是一次完全的灾难。

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.

塑料的使用增加要求更好的废物管理。

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。

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。

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。

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。

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。

C1 noun /ˌʌl.tɪˈmeɪ.təm/

Ultimatum

最后通牒

Meaning

a final demand or statement of terms, the rejection of which will result in retaliation

Example

The boss gave him an ultimatum: improve or be fired.

老板给了他一个最后通牒：要么改进，要么被解雇。

B2 adjective /ʌnˈhɜːd/

Unheard

未听到的; 未知的

Meaning

not heard or listened to; not given a hearing; unknown or unfamiliar

Example

His complaints went unheard by the management.

他的投诉没有被管理层听到。

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。

A2 adjective /ʌnˈhel.θi/

Unhealthy

不健康的; 有害的

Meaning

harmful to health; not in good health; detrimental to well-being

Example

Eating too much fast food is unhealthy for your body.

吃太多快餐对你的身体不健康。

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。

B2 adjective /ˌʌnkənˈvɛnʃənl/

unconventional

非传统的

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.

她非传统的教学方法激发了学生的创造性思维。

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。

B2 adjective /ʌnˈhɜːrt/

unhurt

毫发无损

Meaning

Not injured or harmed.

Example

She walked away from the accident unhurt.

她在事故中毫发无损。

C2 adjective /ˌʌn.rɪˈdʒɛn.ər.ət/

unregenerate

顽固

Meaning

Not reformed or showing no signs of change; stubbornly refusing to reform or repent.

Example

He remained an unregenerate opponent of progress.

他仍然是进步的顽固反对者。

C1 adjective /ʌnˈbraɪdld/

unbridled

无法控制的

Meaning

Uncontrolled and unrestrained.

Example

The protesters showed unbridled enthusiasm for change.

抗议者展示了对改变的无法抑制的热情。

C1 adjective /ʌnˈmɒdɪfaɪd/

unmodified

未修改的

Meaning

not changed from its original form or state

Example

The data was used in its unmodified form for analysis.

这些数据以未修改的形式用于分析。

A2 adjective /ʌnˈhæp.i/

Unhappy

不快乐; 难过

Meaning

not happy; feeling sad or displeased; unfortunate or undesirable

Example

He was unhappy with the results of his exam.

他对考试结果感到不满。

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。

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。

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 /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。

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.

词典解释了难词的正确用法。

B2 adjective /ʌnˈhɛlpfəl/

unhelpful

没有帮助的

Meaning

not providing help or support; making a situation harder rather than easier

Example

His unhelpful attitude slowed down the entire project.

他没有帮助的态度拖慢了整个项目。

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。

B2 adjective /ʌnˈsteɪbəl/

Unstable

不稳定

Meaning

likely to change; not steady or secure; unsteady

Example

The unstable economy made people worried about their jobs.

不稳定的经济让人们担心他们的工作。

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.

她在大学学习法律。

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 /ˌʌnrɪˈfaɪnd/

unrefined

未精炼的

Meaning

not processed or purified; lacking polish or sophistication

Example

The unrefined oil must be processed before it can be used as fuel.

未精炼的石油在用作燃料之前必须进行加工。

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 noun /ˈʌp.rɔːr/

Uproar

骚动; 喧嚣; 混乱

Meaning

a loud and emotional noise or disturbance; public outcry

Example

The announcement caused an uproar among the students.

公告在学生中引起了骚动。

C1 adjective /ʌnˈɡɑː.dɪd/

Unguarded

不设防的

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.

在一个不设防的时刻，她揭示了她对这个项目的真实感受。

C1 adjective /ʌnˈkʌltʃəd/

Uncultured

不文明的; 无文化的

Meaning

lacking good manners, refinement, or education; uncivilized

Example

His uncultured behavior embarrassed everyone at the dinner party.

他在晚宴上的不文明行为让所有人感到尴尬。

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。

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 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。

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。

C2 noun /ˈjuːʒəri/

usury

高利贷

Meaning

The practice of lending money at unreasonably high interest rates.

Example

The law strictly prohibits usury.

法律严格禁止高利贷。

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。

C2 adjective /juːˈbɪkwɪtəs/

ubiquitious

无处不在

Meaning

Present, appearing, or found everywhere.

Example

Smartphones have become ubiquitous in modern society.

智能手机已经在现代社会中无处不在。

C2 adjective /ˌʌnpriːpəˈzɛsɪŋ/

unprepossessing

不吸引人

Meaning

not attractive or appealing in appearance

Example

Despite his unprepossessing looks, he was very kind and intelligent.

尽管他的外貌不吸引人，他还是非常友善和聪明。

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。

C2 adjective /ˌʌnəˈʃʊəd/

unassured

不确定的

Meaning

Lacking confidence or certainty.

Example

She gave an unassured answer during the interview.

她在面试中给出了一个不确定的答案。

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 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 /ʌnˈtaɪmli/

Untimely

不合时宜

Meaning

happening at an inappropriate or inconvenient time; premature

Example

His untimely death at the age of thirty shocked everyone.

他的过早死亡在30岁时震惊了所有人。

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。

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。

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。

C2 adjective /ɜːrˈbeɪn/

urbane

都市的

Meaning

showing polished manners, refinement, and sophistication

Example

He was an urbane gentleman who charmed everyone at the party.

他是一个都市绅士，在派对上迷住了所有人。

A2 adjective /ˈjuːʒəl/

usual

常见

Meaning

habitually or typically occurring or done

Example

It’s our usual meeting spot.

这是我们常见的会议地点。

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。

C1 adjective ʌnˈjiːl.dɪŋ

unyielding

坚定或坚韧

Meaning

Not easily broken or giving in to pressure.

Example

Her unyielding determination helped her overcome all challenges.

她坚定的决心帮助她克服了所有的挑战。

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。

B2 adjective /ʌnˈskɪld/

Unskilled

无技能的; 无技术的工人

Meaning

lacking technical training or ability; not requiring special skills

Example

Many unskilled workers are looking for training opportunities.

许多没有技能的工人正在寻找培训机会。

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 adjective ʌnˈmætʃt

unmatched

无与伦比

Meaning

Not equaled or rivaled by any other; without equal.

Example

The freedom fighters showed unmatched bravery.

自由战士们展示了无与伦比的勇气。

C1 adjective /ˌʌnbɪˈliːvɪŋ/

unbelieving

不相信的

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.

当他声称见过一位名人时，她给了他一个不相信的眼神。

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。

A1 adjective /juːzd/

used

二手

Meaning

having already been used

Example

This is a used car.

这是一辆二手车。

B2 adverb /ʌnˈwɪlɪŋli/

unwillingly

不情愿地

Meaning

in a way that shows reluctance or lack of desire; not willingly

Example

She unwillingly agreed to attend the meeting.

她不情愿地同意参加会议。

B2 adverb /ʌnˈfɛərli/

unfairly

不公平地

Meaning

In a manner that is not just, reasonable, or impartial

Example

He was treated unfairly by the committee.

他被委员会不公平地对待。

C1 verb /ʌnˈroʊl/

unroll

展开

Meaning

to open something that is rolled up; to spread out gradually

Example

She unrolled the map on the table to find the route.

她把地图在桌子上展开来寻找路线。

B2 adjective /ʌnˈraɪp/

Unripe

未成熟的

Meaning

not fully developed or matured; not ready to be eaten

Example

The unripe bananas will turn yellow in a few days.

未成熟的香蕉几天后会变黄。

C1 adjective /ˌʌnəˈfɛktɪd/

unaffected

不受影响的, 自然的

Meaning

Not influenced or touched by something; genuine and natural.

Example

He remained unaffected by the criticism and kept working hard.

他对批评毫不受影响，继续努力工作。

B2 noun ˌɜːbənaɪˈzeɪʃən

urbanization

城市化

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.

城市化导致更先进的基础设施。

B1 adjective /ʌnˈplɛz.ənt/

Unpleasant

令人不悦的

Meaning

not giving or causing pleasure; disagreeable

Example

The medicine had an unpleasant taste.

药物有一种令人不悦的味道。

B2 adjective /ʌnˈwaɪz/

unwise

不明智

Meaning

Showing poor judgment; not sensible or prudent.

Example

It would be unwise to invest all your money in one company.

把所有的钱都投入一家公司的做法不明智。

B2 noun /ˈʌndərˌteɪkɪŋ/

undertaking

事业

Meaning

A task, project, or responsibility that someone agrees to do.

Example

Starting a new company is a difficult undertaking.

创办新公司是一项艰巨的事业。

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。

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。

B2 adjective /ʌnˈendɪŋ/

Unending

无尽的

Meaning

continuing forever; without end

Example

The unending rain made the day feel gloomy.

无尽的雨让这一天显得阴沉。

C2 noun /ˈʌp.wel.ɪŋ/

upwelling

上升流

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.

上升流将营养物质带到海洋表面。

B1 noun /ˌʌnɪmˈplɔɪmənt/

Unemployment

失业

Meaning

the state of being unemployed; lack of paid work

Example

The unemployment rate has increased significantly this year.

今年失业率显著上升。

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。

B2 adjective /ʌnˈberəbəl/

Unbearable

无法忍受

Meaning

too painful, annoying, or unpleasant to tolerate; impossible to endure

Example

The heat in the desert was unbearable.

沙漠中的热度是无法忍受的。

B2 adjective /ˌʌnəˈfɪʃ.əl/

Unofficial

非官方的

Meaning

not officially authorized or confirmed; informal

Example

The unofficial results showed a close race.

非官方的结果显示出一场激烈的比赛。

C2 adjective /ʌnˈflɛdʒd/

unfledged

未经训练的

Meaning

Inexperienced, immature, or not fully developed.

Example

The unfledged writer struggled to complete his first novel.

这个未经训练的作家难以完成他的第一本小说。

A2 noun /ʌmˈbrɛlə/

umbrella

伞

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.

下雨时她打开了她的伞。

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。

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。

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。

C1 adjective /ˌjuːnɪˈlætərəl/

Unilateral

单方面

Meaning

one-sided; involving only one party

Example

The country made a unilateral decision to withdraw from the treaty.

这个国家做出了单方面的决定，退出了条约。

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。

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。

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 /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 /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 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。

B2 adjective /ʌnprəˈdʌk.tɪv/

Unproductive

无效的; 不起作用的

Meaning

not achieving much; not producing good results

Example

The meeting was unproductive and wasted everyone's time.

会议是无效的，浪费了大家的时间。

B1 noun /ˈjuːnɪvɜːrs/

Universe

宇宙

Meaning

all existing matter and space; the cosmos

Example

Scientists study the universe to understand its mysteries.

科学家研究宇宙，以理解它的奥秘。

B2 adjective /ˌʌn.əkˈsep.tə.bəl/

Unacceptable

不可接受

Meaning

not satisfactory or allowable; not acceptable

Example

The quality of work was completely unacceptable.

工作质量完全不可接受。

C2 verb /ˌʌn.dɪˈsiːv/

undeceive

解惑

Meaning

To free someone from a misconception or false belief.

Example

She tried to undeceive him about the false rumors.

她试图让他摆脱这些错误的谣言。

B1 adjective /ˈʌpˌkʌmɪŋ/

upcoming

即将到来

Meaning

about to happen or appear

Example

The upcoming event will be held next week.

即将到来的活动将在下周举行。

A2 noun /ˈʌndərweər/

underwear

内衣

Meaning

Clothing worn beneath outer clothes, typically next to the skin.

Example

He bought new underwear for the trip.

他为旅行买了新的内衣。

B2 adjective /ˌʌnɪnˈtenʃənəl/

Unintentional

非故意的；意外的

Meaning

not done on purpose; accidental

Example

The damage to the car was unintentional.

车的损坏是非故意的。

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。

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。

B1 adjective /ʌnˈkaʊntəbəl/

Uncountable

无法计数的; 无穷的

Meaning

too many to be counted; innumerable; infinite in quantity

Example

There are uncountable stars in the night sky.

夜空中有无数的星星。

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。

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。