adj. contrary to or forbidden by law; "an illegitimate seizure of power"; "illicit trade"; "an outlaw strike"; "unlawful measures"

adj. (of a word or expression) not agreeing with grammatical principles

adj. open wide; "left the doors wide-open"

adj. excluded from use or mention; "forbidden fruit"; "in our house dancing and playing cards were out"; "a taboo subject"

adj. involving or being or having the nature of a crime; "a criminal offense"; "criminal abuse"; "felonious intent"

adj. obtained illegally or by improper means; "dirty money"; "ill-gotten gains"

adj. subject to punishment by law; "a penal offense"

adj. established by or founded upon law or official or accepted rules