unfashionable (adj.)youdaoicibaDictYouDict[unfashionable 词源字典]
1560s, "incapable of being shaped," from un- (1) "not" + fashionable. Meaning "not in accordance with prevailing fashion" is attested from 1640s. Related: Unfashionably.[unfashionable etymology, unfashionable origin, 英语词源]