unlawful (adj.)youdaoicibaDictYouDict[unlawful 词源字典]
"contrary to law, illegal," c. 1300, from un- (1) "not" + lawful. Unlawful assembly is recorded in statutes from late 15c. Related: Unlawfully. Old English had a noun unlagu ("unlaw") "illegal action, abuse of law."[unlawful etymology, unlawful origin, 英语词源]