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 /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。

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 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。

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。

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。

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。

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。

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 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 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。

B2 adjective /ʌnˈriːdəbl/

unreadable

难以辨认的

Meaning

not able to be read or understood clearly; illegible

Example

The doctor’s handwriting was completely unreadable.

医生的字迹完全难以辨认。

C1 adjective /ʌnˈsəʊʃəbl/

unsociable

不合群的

Meaning

not enjoying the company of others; avoiding social interaction

Example

He became unsociable after moving to a new city.

搬到新城市后，他变得不合群。

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。

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。

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 /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。

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。

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.

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 /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。

A1 interjection /ʌ/

uh

呃

Meaning

a sound people make when they hesitate or are unsure what to say next.

Example

Uh, I’m not sure if that’s the right answer.

呃，我不确定这是不是正确的答案。

C1 adjective /ʌnˈskeɪðd/

unscathed

毫发无损

Meaning

Without suffering any injury, damage, or harm.

Example

She escaped from the accident unscathed.

她毫发无损地逃离了事故。

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 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 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。

A2 preposition /əˈpɒn/

upon

之后

Meaning

on or immediately after

Example

Upon hearing the news, he rushed to the hospital.

听到消息后，他赶到医院。

B2 adverb /ˈɜːrdʒəntli/

urgently

紧急地

Meaning

in a way that requires immediate attention or action

Example

The patient urgently needs medical attention.

病人紧急地需要医疗救助。

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 /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。

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。

B2 adjective /ʌnˈfɪt/

Unfit

不适合; 不适当;

Meaning

not in good physical condition; unsuitable or inappropriate

Example

He was declared unfit for military service due to his poor health.

由于健康状况差，他被宣判不适合军事服务。

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 /ˈʌndərhænd/

underhand

阴险

Meaning

done secretly and dishonestly; deceitful

Example

The politician was accused of using underhand tactics to win the election.

那位政治家被指控使用阴险的手段赢得选举。

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。

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。

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 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 noun /ˌjuːnɪˈtɛəriən/

unitarian

一神论者

Meaning

A person who believes that God exists as one entity rather than as a Trinity; a member of a religious denomination that emphasizes individual freedom of belief.

Example

The Unitarian church is known for its inclusive and open-minded approach.

一神论教会以其包容和开放的思想方式而闻名。

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。

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。

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。

C1 adjective /ˌʌnəˈkaʊntəbl/

unaccountable

无法解释

Meaning

Not able to be explained or justified.

Example

She felt an unaccountable fear as she entered the dark room.

她进入黑暗的房间时感到无法解释的恐惧。

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 /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。

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。

A1 pronoun /ʌs/

us

我们

Meaning

used to refer to the speaker and one or more other people as the object of a verb or preposition

Example

She gave us a gift.

她给了我们一个礼物。

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。

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。

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。

C1 adjective /ʌnˈfɔːltərɪŋ/

unfaltering

坚定不移

Meaning

Steady and resolute; not weakening or hesitating

Example

She continued with unfaltering determination.

她以坚定不移的决心继续前进。

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 /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。

C1 noun ˈʌp.raɪ.zɪŋ

uprising

起义

Meaning

An act of resistance or rebellion; a revolt against an authority or government.

Example

The uprising marked the beginning of the revolution.

起义标志着革命的开始。

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。

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 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。

B1 adjective /ʌnˈpɒpjʊlə/

unpopular

不受欢迎的

Meaning

not liked or supported by many people

Example

The decision was unpopular with the public.

这个决定在公众中不受欢迎。

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。

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。

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 /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。

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。

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。

B2 adjective /ʌnˈrɪəl/

unreal

不真实的

Meaning

not real or not based on reality; exaggerated or imaginary

Example

The experience felt unreal after the sudden news.

突如其来的消息后，这种经历感觉不真实。

C1 verb /ʌnˈsɛtl/

unsettle

扰乱

Meaning

To disturb or make someone feel anxious or uneasy.

Example

The sudden news unsettled the entire community.

突如其来的消息让整个社区感到不安。

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。

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。

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。

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。

B1 adjective /ʌnˈseɪf/

Unsafe

不安全; 危险的;

Meaning

involving or causing danger or risk; not protected from harm

Example

It is unsafe to walk alone in this neighborhood at night.

晚上在这个社区独自行走是不安全的。

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。

B2 adjective /ʌnˌkənˈfɜːmd/

Unconfirmed

未确认; 未验证;

Meaning

not confirmed as true or definite; not verified or substantiated

Example

The report remains unconfirmed until we receive official verification.

报告在我们收到官方验证之前保持未确认状态。

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。

B1 verb /ʌnˈpæk/

unpack

拆开

Meaning

to remove items from a container; to explain or analyze something in detail

Example

After arriving home, she began to unpack her suitcase.

到家后，她开始拆开自己的行李箱。

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。

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 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。

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。

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 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。

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。

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。

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。

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。

B2 adjective /ʌnˈɡreɪt.fəl/

Ungrateful

忘恩负义

Meaning

not feeling or showing thanks for something done or given; not appreciating kindness

Example

She felt he was ungrateful for all the help she had given him.

她觉得他对她给予的所有帮助都忘恩负义。

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。

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 /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。

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。

B1 adjective /ˌʌnbɪˈliːvəbəl/

Unbelievable

难以置信

Meaning

impossible to believe; extremely surprising or remarkable

Example

The magician's performance was absolutely unbelievable.

魔术师的表演简直令人难以置信。

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 noun /ˌʌpˈsteəz/

Upstairs

楼上

Meaning

on or to an upper floor of a building; the upper floor or floors

Example

She went upstairs to her bedroom to rest.

她上楼去她的卧室休息。

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。

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 /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 /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 /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。

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。

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 verb /ˈʌndjʊleɪt/

undulate

波动

Meaning

To move with a smooth, wave-like motion.

Example

The snake undulated across the sand.

蛇在沙滩上蜿蜒前行。

B1 noun /ʌnˈhæp.i.nəs/

unhappiness

不快乐

Meaning

the state of being unhappy; sadness or dissatisfaction

Example

Her constant unhappiness affected everyone around her.

她持续的不快乐影响了周围的每一个人。

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。

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。

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。

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 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。

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。

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。

B2 adjective /ʌnˈfeɪ.vər.ə.bəl/

Unfavourable

不利的; 逆境的

Meaning

not helpful or advantageous; adverse

Example

The weather conditions were unfavourable for our outdoor event.

恶劣的天气条件不利于我们的户外活动。

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。

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。

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 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。

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。

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 verb /ˈʌndərˌraɪt/

underwrite

Meaning

To guarantee financial support, especially by agreeing to cover losses or risks; in insurance, to assess and accept risks.

Example

The bank agreed to underwrite the company's new bond issue.

B2 adjective /ˌʌnˈkɔːrdɪneɪtɪd/

uncoordinated

不协调; 笨拙

Meaning

lacking coordination, not well-organized or clumsy in movement

Example

His movements were uncoordinated, making him prone to accidents.

他的动作不协调，使他容易发生意外。

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。

C1 adjective /ʌnˈθɪŋkɪŋ/

unthinking

欠考虑的

Meaning

done without careful thought; automatic or thoughtless

Example

His unthinking remark hurt her feelings.

他欠考虑的评论伤害了她的感情。