illegal

(noun, adjective)

adjective

1. prohibited by law or by official or accepted rules

- an illegal chess move

Similar word(s): unlawful, amerciable, banned, prohibited, black, bootleg, contraband, smuggled, criminal, felonious, dirty, embezzled, misappropriated, extrajudicial, extralegal, nonlegal, hot, illegitimate, illicit, outlaw, outlawed, unlawful, ineligible, misbranded, mislabeled, penal, punishable, unratified, illegitimate, irregular

Sentences with illegal as an adjective:

- This is illegal, you know!

- Moving a pawn backward is an illegal move in chess.

- illegal immigrant;

noun

1. (colloquial, offensive) An illegal immigrant.

2. An illegal resident spy.