unrighteous (adj.)youdaoicibaDictYouDict[unrighteous 词源字典]
1520s; see un- (1) "not" + righteous (adj.). In Middle English, the word was unrightwis, from Old English unrihtwis. Related: Unrighteously; unrighteousness.[unrighteous etymology, unrighteous origin, 英语词源]