Illegal:

Adjective: illegal  i'lee-gul

1. Prohibited by law or by official or accepted rules
         "an illegal chess move"

Noun: illegal  i'lee-gul

1. Someone who has entered a country illegally, is staying longer than allowed by their visa, or is working without a work permit
         - illegal immigrant

Derived forms: illegals

 

Unlawful:

Adjective: unlawful  ,ún'lo-ful

   1. Not conforming to legality, moral law, or social convention
      "unlawful banking practices";
      - improper, unconventional
      
   2. Contrary to or prohibited by or defiant of law
      "unlawful measures"; "unlawful money"; "unlawful hunters"
      
   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

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