attractive (adj.)youdaoicibaDictYouDict[attractive 词源字典]
late 14c., "absorptive," from Middle French attractif (14c.), from attract-, past participle stem of attrahere (see attract). Meaning "having the quality of drawing people's eye or interest" is from 1580s; sense of "pleasing, alluring" is from c. 1600. Related: Attractively; attractiveness.[attractive etymology, attractive origin, 英语词源]
unattractive (adj.)youdaoicibaDictYouDict
1729, from un- (1) "not" + attractive. Related: Unattractively; unattractiveness.