C1 adjective /ˌʌnəbˈtruːsɪv/

unobtrusive

不引人注目

Meaning

not attracting attention; blending in without causing notice

Example

The security cameras are designed to be unobtrusive.

安全摄像头被设计成不引人注目。

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。

B2 adjective /ʌnˌkənˈdɪʃ.ən.əl/

Unconditional

无条件的

Meaning

not subject to any conditions; complete and absolute

Example

She offered her unconditional support to her friend in need.

她在朋友需要时提供了无条件的支持。

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 /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 /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 /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 /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 ʌnˈwɔːr.rən.tɪd

unwarranted

不合理的

Meaning

Not justified or necessary; without good reason.

Example

His anger toward the staff was completely unwarranted.

他对员工的愤怒是完全不合理的。

C2 adjective /ʌkˈsɔːriəs/

uxorious

过度宠爱妻子

Meaning

excessively fond of or submissive to one's wife

Example

He was so uxorious that he agreed with everything his wife said.

他是如此的宠爱妻子，以至于同意了妻子说的每一件事。

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。

B2 adjective /ʌnˈiːvən/

Uneven

不平; 粗糙

Meaning

not level or smooth; not regular or consistent

Example

The road was uneven and full of potholes.

那条路不平，充满了坑洞。

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。

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。

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。

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。

C1 adjective /ʌnˈsɜːrvɪsəbəl/

Unserviceable

无法使用的; 有缺陷的

Meaning

not in working order; unable to be used; defective

Example

The old computer became unserviceable after the system crash.

那台旧电脑在系统崩溃后变得无法使用。

C2 noun /ˌjuːzɜːrˈpeɪʃən/

usurpation

篡夺

Meaning

The act of taking someone's power or property illegally or by force.

Example

The general's usurpation of the presidency led to political unrest.

将军对总统职位的篡夺导致了政治动荡。

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。

C1 adjective /ʌnˈruːli/

Unruly

不守规矩的; 乱七八糟的;

Meaning

difficult to control or manage; disorderly and disruptive

Example

The unruly crowd refused to follow the safety instructions.

那群无法控制的人群拒绝遵循安全指令。

B2 adverb /ʌnˈdaʊtɪdli/

undoubtedly

毫无疑问

Meaning

without a doubt, certainly

Example

He is undoubtedly the best player on the team.

他毫无疑问是队里最好的球员。

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。

C1 adjective /ˌʌnəkˈnɒlɪdʒd/

unacknowledged

未承认的

Meaning

Not recognized, admitted, or accepted; ignored or unnoticed

Example

Her contributions to the project went unacknowledged.

她对项目的贡献未被承认。

B1 adjective /ʌnˈjuː.ʒu.əl/

Unusual

不寻常; 奇怪;

Meaning

not typical; strange; different from what is normal

Example

She wore an unusual dress to the party.

她穿了一件不寻常的衣服去参加派对。

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 /ˈʌpərˌmoʊst/

uppermost

最高

Meaning

situated at the highest place or most important

Example

Her family's safety was uppermost in her mind during the crisis.

她在危机期间心里最重要的是家庭的安全。

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。

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。

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。

C1 noun /ˈʌndərˌɡɑːrmənt/

undergarment

内衣

Meaning

a piece of clothing worn under outer clothes, usually next to the skin

Example

He bought new undergarments for the wedding.

他为婚礼买了新的内衣。

B1 adjective /ˌʌnˈɪntrəstɪŋ/

uninteresting

无趣的

Meaning

not holding attention or curiosity; boring

Example

The lecture was uninteresting and difficult to stay focused on.

这次讲座很无趣，很难集中注意力。

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。

B1 adjective /ʌnɪmˈplɔɪd/

Unemployed

失业

Meaning

without a job; not having paid work

Example

He has been unemployed for six months now.

他已经失业六个月了。

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。

C1 adjective /ʌnˈtɛnəbl/

untenable

无法维持

Meaning

not able to be maintained or defended against attack or objection

Example

The politician resigned when his position became untenable.

政治家在他的立场变得无法维持时辞职。

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。

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 /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 /ʌnˈdɔːntɪd/

Undaunted

无畏的; 勇敢的; 不屈的;

Meaning

not intimidated or discouraged by difficulty, danger, or disappointment

Example

Despite the setbacks, she remained undaunted in pursuing her goals.

尽管遇到挫折，她在追求目标时依然无畏。

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 adverb /ˈʌltəmətli/

ultimately

最终

Meaning

in the end, after everything else

Example

Ultimately, we decided to go ahead with the project.

最终，我们决定继续推进该项目。

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。

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 verb /ˈjuːtɪlaɪz/

utilize

利用

Meaning

to make practical or effective use of something

Example

The company aims to utilize solar energy for production.

公司旨在利用太阳能进行生产。

C2 adjective /ʌnˈɡeɪnli/

ungainly

笨拙

Meaning

Awkward, clumsy, or lacking grace in movement or appearance.

Example

The tall boy moved in an ungainly manner.

那个高个男孩以笨拙的方式走动。

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 /ʌnˈspiːkəbl/

unspeakable

难以形容

Meaning

too bad or shocking to be expressed in words

Example

The survivors endured unspeakable horrors during the war.

幸存者在战争中忍受了难以形容的恐怖。

C1 adjective /ˌʌndərˈhændɪd/

underhanded

阴险

Meaning

acting or done in a dishonest or secret way

Example

They exposed the company's underhanded dealings with its suppliers.

他们揭露了公司与供应商之间的隐秘交易。

B2 adjective /ʌnˈkɒmən/

uncommon

不常见

Meaning

rare, unusual, or remarkable

Example

It is uncommon to see snow in this region.

在这个地区看到雪是不常见的。

C1 adjective /ʌnˈweɪ.vər.ɪŋ/

unwavering

坚定

Meaning

Steady or resolute; not wavering.

Example

He showed unwavering dedication to his goal.

他展示了对目标的坚定承诺。

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。

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 /ʌnˈkwes.tʃən.ə.bl̩/

Unquestionable

无可争议的; 确定的

Meaning

not able to be disputed or doubted; certain and beyond doubt

Example

Her honesty and integrity are unquestionable qualities.

她的诚实和正直是无可争议的品质。

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。

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 adverb /ʌnˈɜːrɪŋli/

unerringly

毫无错误

Meaning

Without making any mistakes; always accurate

Example

The archer aimed unerringly at the target.

弓箭手毫无错误地瞄准了目标。

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 /ˌʌnrɪˈlaɪəbl/

Unreliable

不可靠的; 不能被信任或依赖

Meaning

not dependable; not able to be trusted or relied upon

Example

The old car is unreliable and breaks down frequently.

这辆老车不可靠，常常坏掉。

B2 adjective /ˌʌnrɪˈzɒlvd/

unresolved

未解决的

Meaning

not solved or settled; remaining undecided or unclear

Example

The dispute remains unresolved despite several meetings.

尽管开了几次会议，这个争议仍未解决。

B1 adjective /ʌnˈnesəseri/

Unnecessary

不必要的；多余的

Meaning

not needed; not required; pointless

Example

The meeting was unnecessary since all decisions were already made.

会议是多余的，因为所有的决定已经做出。

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。

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 noun /ˌʌndəˈɡrædʒuət/

undergraduate

本科生

Meaning

a student who has not yet earned a bachelor's degree

Example

She is an undergraduate studying computer science.

她是一个学习计算机科学的本科生。

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 /ˌʌn.dəˈtʃɑːrdʒ/

undercharge

收取较少费用

Meaning

To charge less than the correct or fair amount.

Example

The shopkeeper accidentally undercharged me for the groceries.

店主不小心少收了我购买食品的钱。

B2 adjective /ʌnˈfeɪv(ə)rəbəl/

unfavorable

不利

Meaning

not beneficial or advantageous; showing disapproval or opposition

Example

The proposal received an unfavorable response from the committee.

提案收到了委员会的负面回应。

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。

C1 adjective /ʌnˈtoʊld/

Untold

不可计数的; 无尽的

Meaning

very great in amount or degree; countless; immeasurable

Example

The earthquake caused untold damage to the city.

地震对城市造成了无法计数的损害。

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 verb /ʌpˈbreɪd/

upbraid

斥责

Meaning

To scold or criticize someone harshly.

Example

The teacher upbraided the student for being late again.

老师因为学生再次迟到而训斥了他。

B2 adverb /ʌnˈnesəserəli/

Unnecessarily

不必要地

Meaning

to a greater extent than is needed; without necessity

Example

Don't worry unnecessarily about the exam.

不要为考试不必要地担心。

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 /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。

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 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。

A2 adjective /ˈjuːs.ləs/

Useless

无用

Meaning

having no beneficial purpose; not useful

Example

This broken computer is completely useless.

这个坏掉的电脑完全是无用的。

B2 verb /ˌʌndərˈɛstɪmeɪt/

underestimate

低估

Meaning

To judge something as less important or smaller than it really is.

Example

Never underestimate the power of teamwork.

永远不要低估团队合作的力量。

A2 adjective /ʌnˈlʌki/

Unlucky

倒霉; 不幸运

Meaning

having bad luck; unfortunate

Example

He was unlucky to miss the winning shot.

他很倒霉错过了获胜的投篮。

C2 adjective ˌʌn.əˈseɪ.lə.bəl

unassailable

不可攻破

Meaning

Unable to be attacked, questioned, or defeated.

Example

An unassailable position ensures dominance.

不可攻破的位置确保主导地位。

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。

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 adjective /ʌnˈiːzi/

Uneasy

不安的; 焦虑的; 不舒服的

Meaning

worried; anxious; uncomfortable; restless

Example

She felt uneasy about walking alone at night.

她在夜晚独自行走时感到不安。

C1 adjective /ˌʌnɪˈkwɪvəkəl/

unequivocal

明确

Meaning

Leaving no doubt; clear and unambiguous

Example

She gave an unequivocal answer to the question.

她对问题给出了明确的回答。

A1 preposition /ˈʌndər/

under

下

Meaning

in or to a lower position than something

Example

The cat is under the table.

猫在桌子下面。

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。

C2 adjective /ʌnˈstɪntɪŋ/

unstinting

慷慨的

Meaning

given generously without holding back

Example

She received unstinting support from her family.

她从家人那里得到了慷慨的支持。

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。

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。

C1 adjective /ʌnˈvɔɪst/

unvoiced

未表达

Meaning

not expressed in speech; in phonetics, a sound produced without vocal cord vibration

Example

The student kept her opinion unvoiced during the meeting.

学生在会议期间保持她的意见未表达。

C1 adjective /ˌʌnəˈteɪnəbl/

unattainable

无法实现的

Meaning

impossible to achieve, reach, or accomplish

Example

For many, becoming a professional athlete remains an unattainable dream.

对许多人来说，成为职业运动员仍然是一个无法实现的梦想。

A2 conjunction /ʌnˈlɛs/

unless

除非

Meaning

except if

Example

We won't go unless it stops raining.

除非雨停了，否则我们不去。

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。

B2 adverb juːˈnæn.ɪ.məs.li

unanimously

一致通过

Meaning

With the agreement of all people involved; without opposition.

Example

The proposal was unanimously accepted.

提案得到了全体一致通过。

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 adjective /ˌʌnɪnˈhɪbɪtɪd/

uninhibited

不受抑制的

Meaning

Not restrained or restricted; free in behavior or expression.

Example

She gave an uninhibited laugh at the joke.

她在笑话中放声大笑。

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。

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 adjective /ˌʌndɪˈzaɪərəbl/

Undesirable

不受欢迎的; 有害的; 令人不快的

Meaning

not wanted or wished for; harmful or unpleasant

Example

The new policy had several undesirable consequences.

新政策带来了几个不受欢迎的后果。

C1 noun /ˈʌndərˌstʌdi/

understudy

替身演员

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.

当主角生病时，替身演员上场表演。

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 /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。

Meaning

Designed to be useful or practical rather than attractive; relating to the doctrine that actions are right if they are useful or for the benefit of a majority.

Example

The building had a simple utilitarian design.

B1 adjective /ˌʌndərˈstændəbl/

understandable

可以理解的

Meaning

Able to be understood; reasonable or justifiable.

Example

Her reaction was understandable given the situation.

考虑到情况，她的反应是可以理解的。

C2 verb /ˈʌndərˌmæn/

underman

人员不足

Meaning

to supply with fewer workers or personnel than needed

Example

The hospital was undermanned during the flu outbreak.

医院在流感爆发期间人手不足。

C1 adjective /ʌnˈwɪtɪŋ/

unwitting

无意的

Meaning

Not aware of what is happening; done without realizing.

Example

She became an unwitting participant in the scam.

她成了这场骗局中的一个无意的参与者。

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 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。

B2 adjective /ˌʌnəˈveɪləbəl/

unavailable

不可用

Meaning

Not able to be obtained, reached, or used; not present or accessible.

Example

The manager was unavailable to take calls during the meeting.

经理在会议期间不可用，无法接听电话。

B2 adjective /ˌʌnˈnoʊ.tɪst/

Unnoticed

未被注意到; 被忽视

Meaning

not seen or observed; ignored

Example

His hard work went unnoticed by his manager.

他的辛勤工作没有被经理注意到。

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 /ˌʌnɪˈmædʒənəbəl/

Unimaginable

难以想象的

Meaning

impossible to conceive; beyond imagination

Example

The scale of destruction was unimaginable until we saw it firsthand.

毁灭的规模是难以想象的，直到我们亲眼看到。

C1 adjective /ʌlˈtɪəriər/

ulterior

隐藏的动机

Meaning

hidden or secret, often with a selfish motive

Example

He invited her with an ulterior motive.

他带着隐藏的动机邀请了她。

B2 noun /ˈʌndərkləʊðz/

underclothes

内衣

Meaning

Clothing worn beneath outer clothes, such as underwear or lingerie

Example

He folded his underclothes neatly before packing them.

他在打包前把内衣叠得整整齐齐。