Forbidden by established rules.
Moving a pawn backward is an illegal move in chess.
Totally fictitious, and often issued on behalf of a non-existent territory or country.
An illegal act or technique.
That whatſoever illegals hath been uſed againſt his friends and ſubjects, by impriſoning them without law, or impoſing fines upon their eſtates, be diſclaimed, and that perſons ſo committed be forthwith diſcharged.
Borrowed from French illégal, from Medieval Latin illegalis, from Latin legalis, by surface analysis, il- + legal. In senses relating to immigration, via clipping of illegal alien or illegal immigrant...
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Contraband, esp. illegal substances such as drugs.
…I've got illegals in my bottom…!
An illegal immigrant.
In Manchester and in Aldershot in Hampshire, asylum seeker accommodation was targeted by demonstrators carrying placards that read “deport them, don’t support them” and “no apartments for illegals”.