unknownadj.
英 ʌn'nəʊn | 美 ,ʌn'non
中文adj. 未知的；陌生的，默默无闻的\nn. 未知数；未知的事物，默默无闻的人
未知的；陌生的，默默无闻的
n. 未知数；未知的事物，默默无闻的人
词根词源
unknown (adj.)c. 1300, "strange, unfamiliar" (of persons, places), from un- (1) "not" + past participle of know (v.). Compare Old English ungecnawen. In reference to facts, "not discovered or found out," it attested from early 14c. The noun meaning "unknown person" is recorded from 1590s; the unknown "that which is unknown" is from 1650s.
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