Unknown
来自Big Physics
Safin（讨论 | 贡献）2022年4月27日 (三) 02:08的版本 （建立内容为“Category:etymology == wiktionary == [https://en.wiktionary.org/wiki/unknown ref] From un- + known, past participle of know. Compare [https://en.wikiped…”的新页面）
wiktionary
From un- + known, past participle of know. Compare Old English ungecnawen.
etymonline
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.
