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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]