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Not known or difficult to know
Synonyms
secret
adjective /ˈsiːkrət/
a
not known about by many people 不为人所知的

We love coming here because it's like a secret garden. 我们喜欢来这里是因为这就像是个秘密花园。

 Synonyms and related words
Secret, secretive and in secret: secret, secretive, surreptitious...
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
private
adjective /ˈpraɪvət/
1b
understood by only a few people, not by everyone 私密的;私下的

a private joke 私下的玩笑

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
personal
adjective /ˈpɜː(r)s(ə)nəl/
2
private and not known or available to most people 私密的;隐私的

This is a personal matter and does not concern you. 这是个人隐私,不关你的事。

a personal conversation/letter 私人谈话/信件

for personal reasons :

She resigned from her job for personal reasons. 出于个人的原因,她辞去了工作。

personal problems (=ones concerning your relationships or health) 私人问题 :

He's had a few personal problems recently. 他最近有些私人问题。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
strange
adjective /streɪndʒ/
2
not familiar or known to you 陌生的;不熟悉的

When you arrive in a new country, everything seems strange. 当你到了一个新的国家,一切都显得陌生。

a strange accent 陌生的口音

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unknown
adjective /ʌnˈnəʊn/
1
if something is unknown, people do not know about it or do not know what it is 不为人知的;未知的;不了解的

Several hundred people were affected by the previously unknown virus. 好几百人感染了那种原先还不为人知的病毒。

be unknown to someone :

Most of her friends are unknown to me. 她的大多数朋友我都不认识。

for some unknown reason :

For some unknown reason, the plane landed at the wrong airport. 不知什么原因,飞机降落错了机场。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
uncertain
adjective /ʌnˈsɜː(r)t(ə)n/
1
not clearly known or understood 不确知的;不确定的

The origin of the word is uncertain. 这个词的词源尚不清楚。

it is uncertain whether/why/how etc :

It is uncertain how they entered the property. 不清楚他们是怎样进入那处私人领地的。

remain uncertain :

Despite recent research, the precise mechanism of the virus remains uncertain. 尽管最近已作了研究,但该病毒的精确结构仍不得而知。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
hidden
adjective [usually before noun] /ˈhɪd(ə)n/
1
if something is hidden, most people do not know about it or understand it 秘密的;不为人知的

Jones has recently revealed hidden talents as an actor. 琼斯近来显露出了不为人知的表演才华。

the hidden costs of being in hospital 住院产生的一些隐性费用

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
 Synonyms and related words
Not obvious: unclear, subtle, underlying...
mysterious
adjective /mɪˈstɪəriəs/
1a
not recognized or known 认不出的;未知的

a mysterious woman in a white suit 穿一套白衣服的神秘女人

a mysterious illness 未知的疾病

 Synonyms and related words
Not known or difficult to know: secret, private, personal...

mysteriously

adverb
 Synonyms and related words
Secret, secretive and in secret: secret, secretive, surreptitious...
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
 Synonyms and related words
Complicated and difficult to understand: complicated, difficult, complex...
anonymous
adjective /əˈnɒnɪməs/
1
if someone is anonymous, no one knows their name 匿名的;无名的

The bomb threat was made by an anonymous caller. 炸弹恐吓来自一个匿名电话。

a witness who wished to remain anonymous 不想透露姓名的证人

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
1a
used about something that is done, written etc by someone whose name is not known 匿名的

an anonymous phone call/letter 匿名电话/信

 Synonyms and related words
Not known or difficult to know: secret, private, personal...

anonymously

adverb
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
obscure
adjective /əbˈskjʊə(r)/
1
not known about, or not well known 不知晓的;无名的;默默无闻的

Details of this period of Shakespeare's life remain obscure. 对莎士比亚这一时期的生活详情仍然不清楚。

The report had been published in an obscure German journal. 这篇报道被登在一本名不见经传的德国期刊上。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
 Synonyms and related words
Not famous: unknown, obscure, unrecognized...
More Synonyms
behind someone's back
phrase
if you do something bad or unkind behind someone's back, you do it without them knowing 背着某人;背地里

The kids were always making fun of him behind his back. 孩子们背地里总是拿他开玩笑。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
behind the scenes
phrase
2
not seen or heard by the audience of a film, play etc (电影、戏剧等)在幕后

He prefers to work behind the scenes as a director. 他更愿意作为导演在幕后工作。

 Synonyms and related words
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
chicken-and-egg
adjective [only before noun]
a chicken-and-egg situation is one where it is impossible to say which of two things happened first or caused the other to happen 孰先孰后难定的;因果难定的
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
dark
adjective /dɑː(r)k/
7
[usually before noun] a dark secret or mystery is kept well hidden, especially because people would not approve if they knew about it 隐秘的;深藏的
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
8
[only before noun] a dark place is distant and mysterious because very little information is known about it (地方)遥远神秘的

in some dark corner of his mind 在他头脑中的某个神秘角落

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
fall on deaf ears
phrase
if something such as a warning, a request, or an attempt to change someone's attitude falls on deaf ears, it is completely ignored by the person who hears it (警告、请求或努力等)被完全忽视,不受注意
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
finely
adverb /ˈfaɪnli/
3
if something such as a situation or a game is finely balanced or finely poised, it is impossible to guess how it will end (形势或比赛等)不明朗地,难分伯仲地
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
ignorance is bliss
phrase spoken
used for saying that it is better not to know something, because then you will not worry 无知是福,难得糊涂(指不知道某事时就不用担心)
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
incalculable
adjective /ɪnˈkælkjʊləb(ə)l/
2
something that is incalculable is not certain enough to be planned for or known about before it happens 难以确定的;不可预料的

an incalculable risk 难以预料的风险

 Synonyms and related words
Not known or difficult to know: secret, private, personal...

incalculably

adverb
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
 Synonyms and related words
Words used to describe large amounts and quantities: substantial, considerable, extensive...
incognito
adverb /ˌɪnkɒɡˈniːtəʊ/
using a false name, or changing your appearance so that you will not be recognized 隐姓埋名地;使用化名地;隐瞒真实身份地
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
inconceivable
adjective /ˌɪnkənˈsiːvəb(ə)l/
1
impossible to think about or imagine 不可思议的;无法想象的

a nuclear accident with inconceivable consequences 后果无法想象的核事故

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
 Synonyms and related words
Not likely to happen: unlikely, doubtful, remote...
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
indeterminable
adjective /ˌɪndɪˈtɜː(r)mɪnəb(ə)l/
impossible to know or establish accurately 无法探明的;无法确定的
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
indeterminate
adjective /ˌɪndɪˈtɜː(r)mɪnət/
not known or clearly established 未知的;不明确的;模糊的

a man of indeterminate age 年纪不确定的男人

 Synonyms and related words
Not known or difficult to know: secret, private, personal...

indeterminacy

noun [U]
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
intangible
adjective /ɪnˈtændʒəb(ə)l/
not able to be touched or measured, and difficult to describe or explain 触摸不到的;难以捉摸的;不易形容的;难以言喻的

She has that intangible quality that a player must possess to be a champion. 她具有冠军运动员所必备的那种无法形容的素质。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
in the background
phrase
3
in a place or situation in which people do not notice you 在不引人注意的地方;在幕后

Jo does the publicity work, while Ed stays very much in the background. 乔做宣传工作,而埃德则主要做幕后工作。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
invisible
adjective /ɪnˈvɪzəb(ə)l/
3
not officially recognized or fairly represented 被忽视的;未被正式认可的

Many minority groups are invisible on the major American television networks. 许多少数群体在美国的主流电视网上受到忽视。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
I/you/he etc can only guess
phrase
used for emphasizing that something is not known, especially someone's feelings or the degree to which something is happening 我/你/他等只能猜测

Why this approach failed, we can only guess. 我们只能猜测这种方法失败的原因。

I/you/he etc can only guess at :

Melissa could only guess at what the child must be feeling. 梅利莎只能猜测孩子那时的感觉。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
little does someone know/realize
phrase
used for saying that someone does not know/realize that something is true 某人不知道/没想到/没有意识到(某事物属实)

Little did I realize I would one day be in charge of the office. 我没有意识到我有一天也会成为办公室主管。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
misunderstood
adjective /ˌmɪsʌndə(r)ˈstʊd/
if someone or something is misunderstood, people do not realize what they are really like 被误解的;被曲解的
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
mystery
adjective [only before noun] /ˈmɪst(ə)ri/
a mystery person or thing is someone or something that you do not know the name of or do not know anything about 神秘的

a mystery caller 神秘的来访者

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
nameless
adjective /ˈneɪmləs/
1a
a nameless person or thing has a name that you do not know 不知名的;匿名的

pictures taken by a nameless photographer 一位不知名的摄影师拍的照片

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
 Synonyms and related words
there is more to someone than meets the eye
phrase
used for saying that someone has qualities or experience that someone else does not know about 某人还有不为人知的品质(或经历)

Steve needs to prove that there is more to him than meets the eye.

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
there's no knowing/saying/telling etc
phrase
it is impossible to know/say etc what is true or what will happen next 无法知道;谁也说不准

There's no saying what they might be capable of achieving. 很难说他们可能会取得什么成就。

There's no telling how much she overheard. 很难说她偷听到了多少。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unaccounted for
adjective /ˌʌnəˈkaʊntɪd ˌfɔː(r)/
2
if something is unaccounted for, you are unable to explain what happened to it or where it is 无法解释的
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unacknowledged
adjective /ˌʌnəkˈnɒlɪdʒd/
1
not given the praise or admiration that is deserved 未被赏识的;未得到认可的

His contribution to contemporary music was largely unacknowledged. 他对当代音乐的贡献在很大程度上没有得到认可。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
2
ignored or not thought about in a conscious way 未被注意的;被忽视的

Dreams often contain unacknowledged fears and anxieties. 梦中常常出现被忽视了的恐惧和焦虑。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
undeclared
adjective [usually before noun] /ˌʌndɪˈkleə(r)d/
1
an undeclared activity or situation exists but has not been formally or officially announced 未正式宣布的
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
underground
adjective /ˈʌndə(r)ˌɡraʊnd/
1a
not well known by most people and different from what is usual or popular 不为大多数人所知的;非主流的;与众不同的
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
undisclosed
adjective /ˌʌndɪsˈkləʊzd/
not reported publicly 未公开(报道)的

The company was sold for an undisclosed sum. 公司被卖掉了,卖多少钱没有公开。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
undiscovered
adjective /ˌʌndɪˈskʌvə(r)d/
not noticed or known about 未被发觉的;不为人知的
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unexplained
adjective /ˌʌnɪkˈspleɪnd/
an unexplained event seems to have no explanation or reason 莫名其妙的;原因不明的

an unexplained death 原因不明的死亡

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unexplored
adjective /ˌʌnɪkˈsplɔː(r)d/
1
never visited by people 未经勘探的;尚未考察的

an unexplored cave 未经勘探的洞穴

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
2
not thought about or considered before 未想到的;未考虑过的
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unfamiliar
adjective /ˌʌnfəˈmɪljə(r)/
a
used about things that you have no knowledge or experience of 未见过的;未听说过的;陌生的

feelings of nervousness at being in unfamiliar surroundings 在陌生环境中产生的紧张感

unfamiliar to :

The rules of the game are quite unfamiliar to most people. 这项比赛的规则对大多数人来说相当陌生。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...

unfamiliarity

/ˌʌnfəˌmɪliˈærəti/ noun [U]
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unforeseeable
adjective /ˌʌnfɔː(r)ˈsiːəb(ə)l/
impossible to know about or expect 无法预见的;无法预料的
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unheard
adjective /ʌnˈhɜː(r)d/
1
ignored 被忽视的
go unheard :

Her ideas went unheard yet again. 她的想法再次无人理会。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unheeded
adjective /ʌnˈhiːdɪd/
ignored 被忽视的
go unheeded :

All of her suggestions had gone unheeded. 她的所有建议均未引起注意。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unheralded
adjective /ʌnˈherəldɪd/
1
mainly journalism not previously noticed or praised much 事先未注意到的;未预见到的;先前未受表扬的
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unidentifiable
adjective /ˌʌnaɪˈdentɪˌfaɪəb(ə)l/
impossible to recognize or name 无法辨认的;无法识别的
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unidentified
adjective /ˌʌnaɪˈdentɪˌfaɪd/
not recognized or known 未被认出的;身份不明的;未知的

an unidentified gunman/person/body 身份不明的持枪歹徒/身份不明的人/无名尸体

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unknowable
adjective formal /ʌnˈnəʊəb(ə)l/
impossible to know 不可知的;不可认识的
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unknown to someone
phrase
used for saying that someone does not know something 不为某人所知的

Unknown to the MP, his secretary had already spoken to reporters. 这位议员还不知道,他的秘书已跟记者说了。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unmarked
adjective /ʌnˈmɑː(r)kt/
1
something that is unmarked has no words or symbols on it to show what or where it is 未做记号的;没有标志的

an unmarked police car 没有标志的警车

an unmarked grave 无标记的坟墓

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unrecognized
adjective /ʌnˈrekəɡnaɪzd/
1
if something is unrecognized, people do not know or admit that it exists 未被认出的;未被认可的

Doctors have identified a previously unrecognized form of the disease. 医生已识别出了一种过去不知道的疾病。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
1a
used about good things that people do that no one thanks or admires them for 没有得到感谢的;无人赞赏的
go unrecognized :

Much of their hard work goes unrecognized. 他们的辛勤劳动大多得不到承认。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unrecorded
adjective /ˌʌnrɪˈkɔː(r)dɪd/
1
not written about or mentioned in official documents 未被官方记载的
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unremarked
adjective formal /ˌʌnrɪˈmɑː(r)kt/
not noticed or discussed, usually because no one is interested (通常因无人感兴趣而)未被注意的,未被讨论的

Their arrival went largely unremarked. 他们的到来未曾引起多大关注。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unseen
adjective /ʌnˈsiːn/
not seen or known about by anyone 未被看见的;无人觉察的

unseen forces/troops/enemies 未被发现的部队/军队/敌人

the unseen hand that holds the camera 拿着相机的那只看不见的手

 Synonyms and related words
Not clear to the senses: faint, invisible, subtle...
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unsolved
adjective /ʌnˈsɒlvd/
an unsolved problem or mystery is one that you have not dealt with or explained 未解决的;未解释的
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unspecified
adjective /ʌnˈspesɪfaɪd/
not mentioned, or not known 未提及的;不知道的

She owes a large but unspecified amount of money. 她欠了一大笔钱,但具体数目不知道。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
unsuspected
adjective /ˌʌnsəˈspektɪd/
existing without your knowledge 未知的;未被想到的

A previously unsuspected kidney disease caused her death. 一种前所未闻的肾病导致了她的死亡。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
when someone's back is turned
phrase
when someone is not there, or is not paying attention 当某人不在时;当某人不注意时

I don't know what these kids get up to when my back is turned.

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
you don't know/haven't heard the half of it
phrase spoken
used for telling someone that a situation is more shocking or complicated than they think 你还不知道更要紧的那部分呢
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
Others

imponderable

adjective
 Synonyms and related words
Not known or difficult to know: secret, private, personal...
new
adjective /njuː/
3a
new information or facts are things that you did not know previously (消息或事实)最新的

Police have now been given some new information. 警察现已获得了一些最新信息。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...
2b
if someone discovers something new, they find something that no one else knows about 新发现的;不为人知的

Scientists have discovered a new drug for the treatment of depression. 科学家们发现了一种治疗抑郁症的新药。

new to :

Many of these plants are entirely new to science. 这些植物中有许多在科学界还不为人知。

 Synonyms and related words
Not known or difficult to know: secret, private, personal...

unimaginably

adverb
 Synonyms and related words
Not known or difficult to know: secret, private, personal...

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