This flashcard defines the word "unknown", covering its various meanings as an adjective (not known, not understood, not recognized, not famous, never occurring) and as a noun (a thing that is not known, a place that is not known, an unrecognized person, an unknown quantity).
[ADJ 形容词]不知道的；不了解的；未知的 If something is unknown to you, you have no knowledge of it.
An unknown number of demonstrators were arrested...
有数目不详的示威者遭到了逮捕。
How did you expect us to proceed on such a perilous expedition, through unknown terrain...
你怎么能指望我们如此冒险地穿越未知的地域，继续这一探险？
The motive for the killing is unknown.
杀人动机不明。
An unknown is something that is unknown.未知的事物
The length of the war is one of the biggest unknowns.
战争要持续多久是最大的未知数之一。
2
[ADJ 形容词]不认识的；不熟悉的；陌生的 An unknown person is someone whose name you do not know or whose character you do not know anything about.
Unknown thieves had forced their way into the apartment...
不知名的窃贼破门闯入了公寓。
I could not understand how someone with so many awards could be unknown to me.
我想不通自己竟然不认识获了这么多奖的人。
3
[ADJ-GRADED 能被表示程度的副词或介词词组修饰的形容词]不出名的；无人知晓的；未获公众认可的 An unknown person is not famous or publicly recognized.
He was an unknown writer.
他是个名不见经传的作家。
...a popular environment where both established and unknown artists can meet, talk and drink.
成名和未成名的艺术家都可以聚会、聊天及喝酒的一处热门场所
An unknown is a person who is unknown.不出名的人
Within a short space of time a group of complete unknowns had established a wholly original form of humour.
在很短的一段时间内，一群完全籍籍无名之辈创立了一种全新的幽默形式。
4
[ADJ 形容词]从未发生的；从未存在的 If you say that a particular problem or situation is unknown, you mean that it never occurs.
[usu v-link ADJ]
A hundred years ago coronary heart disease was virtually unknown in Europe and America.
在100年前冠心病几乎不存在于欧洲和美洲。
5
[N-SING 单数名词]（总称）未知事物，不为人知的地方The unknown refers generally to things or places that people do not know about or understand.
[the N]
Ignorance of people brings fear, fear of the unknown.
人们的无知会带来恐惧，对未知事物的恐惧。
Oxford
un·known★/ˌʌnˈnəʊn; NAmEˌʌnˈnoʊn/
adjective
,
noun
unknownunknownsadjective★1★unknown(to sb) not known or identified 未知的；不详的；未被确认的◆a species of insect previously unknown to science科学上以前尚未了解的一种昆虫◆He was trying, for some unknown reason,to count the stars. 不知何故，他试图数星星。◆The man's identity remains unknown.这名男子的身分还是个谜。2★(of people 人)not famous or well known 不出名的；无名的◆an unknown actor没有名气的演员◆The author is virtually unknown outside Poland.在波兰以外，这位作者实际上鲜为人知。3★never happening or existing 从未发生的；从不存在的◆The disease is as yet unknown in Europe (= there have been no cases there).这种疾病至今尚未在欧洲出现过。◆It was not unknown forpeople to have to wait several hours (= it happened sometimes).人们得等几个小时的事时有发生。IDIOMSan ˌunknown ˈquantitya person or thing whose qualities or abilities are not yet known 未知数（指尚不清楚，有待证实的人或事物）unknown to sbwithout the person mentioned being aware of it …尚不知道；把…蒙在鼓里◆Unknown to me, he had already signed the agreement.他背着我已签了协议。noun1the unknown[singular ]places or things that are not known about 未知的地方（或事物）◆a journey into the unknown探险之旅◆a fear of the unknown对未知事物的恐惧2[countable ]a person who is not well known 无名者；不出名的人◆A young unknown played the leading role.演主角的是一个名不见经传的年轻人。3[countable ]a fact or an influence that is not known 不明的情况；未知的因素◆There are so many unknowns in the proposal.这项提案中的未知数太多了。4[countable ]( mathematics 数) a quantity that does not have a known value 未知数；未知量◆X and Y in the equation are both unknowns.等式中的 X 和 Y 都是未知数。un·known/ˌʌnˈnəʊn; NAmEˌʌnˈnoʊn/
1not known about: The murderer’s identity remains unknown.For some unknown reason, Mark quit his job and moved to Greece. a voyage through unknown territoryAn unknown number of people were killed.2not famous: an unknown artist3unknown to somebody without someone knowing: Unknown to his wife, Ron had been having an affair.4be an unknown quantity if someone or something is an unknown quantity, you do not know what their abilities are or how they are likely to behave
unknown1 adjective, adverb
unknown2 noun
unknownunknown2 noun [countable]
Examples
Thesaurus
Collocations
Phrases
1someone who is not famous: At that point in her career she was still an unknown.2something that is not known: The long-term effects of the drug are still an unknown.3the unknowna)a place that is not known about or that has not been visited by humans: The astronauts began their journey into the unknown.b)things that you do not know or understand: a fear of the unknown
WDF
unknown
[ˌʌnˈnəʊn]
CET4CET6TEM4
n19258
506
94
48
122
142
100
j2842
12261
1473
2228
2755
2116
3689
ADJ2777
451494
NOUN18461
15416
未知的(91%)，不出名的(9%)
n.未知数；未知的事物，默默无闻的人
adj.未知的；陌生的，默默无闻的
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