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.
雙語例句
1. The best thing to do when entering unknown territory is smile.
踏入未知地帶最好的對策就是微笑。
來自美劇《凱莉日記》
2. It is not unknown for valuable display items to go, ahem, missing.
貴重的展品，呃哼，丟失的話，會眾人皆知。
來自柯林斯例句
3. The contract was awarded to a previously unknown company.
合同簽給了一個之前并不知名的公司。
來自柯林斯例句
4. Ignorance of people brings fear, fear of the unknown.
人們的無知會帶來恐懼，對未知事物的恐懼。
來自柯林斯例句
5. Unknown thieves had forced their way into the apartment.