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。

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 /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 /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。

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 verb /ˈʌndərkʌt/

undercut

Meaning

to sell at a lower price than a competitor; to weaken or undermine something

Example

The company tried to undercut its rivals by offering lower prices.

B2 adjective /ʌnˈfeɪθ.fəl/

Unfaithful

不忠诚

Meaning

not loyal or true to a spouse, partner, or commitment

Example

He was unfaithful to his wife for many years.

他对妻子不忠诚多年。

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 adjective /ʌnˈwel.kəm/

Unwelcome

不受欢迎的; 不想要的; 不邀请的

Meaning

not wanted or accepted; not invited or pleasant

Example

The unwelcome news ruined their vacation plans.

不受欢迎的消息破坏了他们的度假计划。

C2 verb /ˌʌndərˈɡɜːrd/

undergird

支持，强化

Meaning

to provide support or foundation for; to strengthen

Example

Strong values undergird a healthy society.

强大的价值观支撑着一个健康的社会。

C2 adjective /ʌnˈblʌʃɪŋ/

Unblushing

厚颜无耻的; 放肆的

Meaning

showing no shame or embarrassment; boldly shameless

Example

He told the unblushing lie without any hesitation.

他毫不犹豫地说了那个无耻的谎言。

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。

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。

C2 adjective /ˌʌnprəˈpɪʃəs/

unpropitious

不利

Meaning

Not giving or indicating a good chance of success; unfavorable.

Example

The team began their journey under unpropitious weather conditions.

团队在不利的天气条件下开始了他们的旅程。

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 /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 noun /ˈʌpˌkiːp/

up-keep

维护

Meaning

The process or cost of maintaining something in good condition.

Example

The upkeep of the old house is very expensive.

老房子的维护非常昂贵。

C1 adjective /ʌnˈkleɪmd/

Unclaimed

未认领的; 未要求的; 被遗弃或无主的

Meaning

not claimed by anyone; not demanded or requested; abandoned or ownerless

Example

The unclaimed luggage was stored in the airport's lost property department.

未认领的行李被存放在机场的失物招领处。

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 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。

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 noun /ˈjuːnɪvəˌlɛns/

univalence

单价性

Meaning

The state of having a single valence or combining power, especially in chemistry.

Example

Hydrogen is characterized by its univalence in chemical reactions.

氢气在化学反应中以其单价性为特点。

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。

B2 adjective /ˌʌndərˈlaɪɪŋ/

underlying

基本的

Meaning

basic or hidden but important; forming the foundation of something

Example

The underlying reason for the conflict was never addressed.

冲突的根本原因从未得到解决。

B1 adjective /ʌnˈmærid/

unmarried

未婚

Meaning

Not married; single.

Example

He is thirty-five and still unmarried.

他三十五岁，仍然未婚。

C1 adjective /ʌnˈtʃælɪndʒd/

Unchallenged

无可争议的; 被接受的没有反对; 没有对手

Meaning

not disputed or questioned; accepted without opposition; having no rival

Example

He remained the unchallenged champion for five years.

他五年保持不败的冠军。

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。

C1 adjective /ʌnˈmaɪndfəl/

Unmindful

不留心的; 疏忽的;

Meaning

not paying attention; careless; heedless

Example

She was unmindful of the danger around her.

她没有注意到周围的危险。

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。

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。

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。

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 /ʌnˈsiːn/

Unseen

看不见的；未曾看到或注意到的

Meaning

not previously seen or noticed; invisible; hidden

Example

The unseen forces of nature can be very powerful.

自然界的看不见的力量可能非常强大。

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 /ʌnˈbreɪkəbəl/

Unbreakable

不能被打破或损坏；非常强大和耐用

Meaning

not able to be broken or damaged; very strong and durable

Example

Their friendship formed an unbreakable bond.

他们的友谊形成了一个坚不可摧的纽带。

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。

C2 noun /ˈʌŋɡwənt/

unguent

药膏

Meaning

A soothing or healing ointment applied to the skin.

Example

The doctor applied an unguent to heal the burn.

医生涂抹了药膏来治愈烧伤。

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。

C1 adjective /ˌʌnsəˈfɪstɪˌkeɪtɪd/

unsophisticated

不复杂

Meaning

Lacking worldly experience, refinement, or complexity.

Example

The villagers led an unsophisticated but happy life.

村民过着简单而幸福的生活。

B2 verb /ˌʌndərˈskɔːr/

underscore

强调

Meaning

to emphasize or highlight something

Example

The incident underscored the need for better safety measures.

这起事件突显了更好安全措施的必要性。

C2 adjective /ʌnˈsʌlid/

unsullied

无暇

Meaning

not spoiled or made impure; perfectly clean or pure

Example

His reputation remained unsullied despite the accusations.

尽管有指控，他的声誉仍然无暇。

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。

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 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。

C1 adjective /ʌnˈsteɪtɪd/

unstated

未声明

Meaning

not expressed directly in words; implied or left unsaid

Example

The contract included several unstated expectations.

合同包括了几个未声明的期望。

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。

C1 verb /ʌnˈrævəl/

unravel

Meaning

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

Example

The detective worked hard to unravel the mystery.

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。

B2 adjective /ˌʌndɪˈsaɪdɪd/

Undecided

未决定的; 不确定的

Meaning

not having made a decision; uncertain

Example

She was undecided about which college to attend.

她对于选择哪个大学感到未决定。

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。

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 /ˌʌnrɪˈkwaɪtɪd/

unrequited

Meaning

Not returned or reciprocated, especially in the context of love or affection.

Example

He suffered from unrequited love for years.

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。

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。

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 /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。

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。

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 /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 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 /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。

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。

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 ʌnˈplænd

unplanned

未计划的

Meaning

Not planned or arranged in advance; happening spontaneously without preparation.

Example

Unplanned urbanization contributes to environmental issues.

无计划的城市化会加剧环境问题。

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。

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。

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。

C2 noun /ˈɜːrtʃɪn/

urchin

街头小孩

Meaning

a mischievous or poorly dressed child, often from the streets

Example

The ragged urchins played by the riverbank.

那些穿着破烂的街头小孩在河边玩耍。

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。

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 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。

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 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。

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。

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 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 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。

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。

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。

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 noun /ˈjuːzər/

user

用户

Meaning

a person who uses or operates something

Example

He is a frequent user of this app.

他是这个应用程序的常用用户。

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 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。

C2 adjective /ˌʌnɪkˈsɛpʃənəbl/

unexceptionable

无可指摘

Meaning

Not open to objection; acceptable and unobjectionable

Example

His behavior was unexceptionable throughout the event.

他的行为在整个事件中都是无可指摘的。

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。

B2 verb /ˌʌndərˈteɪk/

undertake

承担

Meaning

to commit to and begin a task or project; to take on responsibility

Example

She decided to undertake a challenging project.

她决定承担一个具有挑战性的项目。

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。

B2 noun /ʌnˈkaɪndnəs/

unkindness

不友善

Meaning

lack of kindness; cruel or inconsiderate behavior

Example

His unkindness hurt her feelings deeply.

他的不友善深深伤害了她的感情。

C1 adjective /ʌnˈsoʊld/

unsold

未售出的

Meaning

not sold; remaining without a buyer

Example

The unsold goods were returned to the warehouse.

未售出的商品被退回仓库。

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。

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 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。

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。

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。

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 verb /ʌnˈmɑːsk/

unmask

揭露；暴露真相

Meaning

to remove a mask or covering; to reveal the true identity, nature, or intentions of someone or something

Example

The investigation helped unmask the real culprit behind the crime.

调查帮助揭露了犯罪背后的真正罪犯。

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。

C1 verb /ˌʌndərˈsteɪt/

understate

低估

Meaning

To describe something as being less important or serious than it really is.

Example

He tends to understate his achievements.

他倾向于低估自己的成就。

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 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 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 /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 verb /juˈzɜrp/

usurp

篡位

Meaning

to take someone's position of power illegally or by force

Example

The general tried to usurp the king's throne.

将军试图篡夺国王的王位。

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。

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。

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。

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 /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。

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 /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 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。

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 /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 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 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。

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。

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。

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 /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。

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 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。