Definitions of unlawful:

• adjective:   contrary to or prohibited by or defiant of law

  Example: "Unlawful measures"

• adjective:   having no legally established claim
• adjective:   not morally right or permissible

  Example: "Unlawful love"

• adjective:   not conforming to legality, moral law, or social convention
• adjective:   contrary to or forbidden by law

  Example: "Unlawful measures"