illegal
1. [ adjective ] (law) prohibited by law or by official or accepted rules
Examples:

"an illegal chess move"

Related terms: legal illegitimate bootleg hot black extralegal misbranded embezzled banned embezzled under-the-counter dirty ineligible criminal under-the-counter unratified extrajudicial penal dirty amerciable irregular illegitimate unlawful legality
Similar spelling:   illegally
  illegalize
  illegality
  illegalise