WordWeb Online

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

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

See also: amerciable, banned, black, black-market, bootleg, contraband, criminal, dirty, embezzled, extrajudicial, extralegal, felonious, hot [informal], illegitimate, ill-gotten, illicit, ineligible, irregular, legality, legalness [rare], misappropriated, misbegotten, misbranded, mislabeled [US], mislabelled [Brit, Cdn], nonlegal, outlaw, outlawed, penal, prohibited, punishable, smuggled, under-the-counter, unlawful, unratified

Antonym: legal

Encyclopedia: Illegal, Unreported and Unregulated Fishing