thievish (adj.)youdaoicibaDictYouDict[thievish 词源字典]
mid-15c., "of or pertaining to thieves," from thieve or thief + -ish. Meaning "inclined to steal" is from 1530s. Wyclif and Chaucer used thiefly (late 14c.). Related: Thievishly; thievishness.[thievish etymology, thievish origin, 英语词源]