- unaccustomed (adj.)
[unaccustomed 词源字典]
- 1520s, "not customary, unfamiliar," from un- (1) "not" + past participle of accustom (v.). Meaning "not accustomed or habituated" (to) is first attested 1610s (see accustomed).[unaccustomed etymology, unaccustomed origin, 英语词源]