WordWeb Online

1. Contrary to or prohibited by or defiant of law
   "unlawful measures"; "unlawful money"; "unlawful hunters"
    
2. Not conforming to legality, moral law, or social convention
   "unlawful banking practices";
   - improper, unconventional
    
3. Not morally right or permissible
   "unlawful love"
    
4. Having no legally established claim
   "the unlawful heir to the throne";
   - wrongful
    
5. Contrary to or forbidden by law
   "unlawful measures";
   - illegitimate, illicit, outlaw, outlawed

See also: bent [Brit, informal], corrupt, crooked [informal], illegal, illegitimate, illicit, irregular, lawfulness, lawless, outlaw, wide-open, wrongful

Antonym: lawful

Encyclopedia: Unlawful