illicit
adjective
1 illicit drugs:
illegal, unlawful, illegitimate, against the law;
outlawed, banned, forbidden, prohibited, interdicted, proscribed, not allowed, not permitted;
criminal, lawbreaking, actionable, felonious;
unlicensed, unauthorized, unsanctioned, unwarranted, unofficial;
contraband, black-market, under the counter, bootleg;
Law malfeasant;
German verboten;
rare non licet.
▷antonyms licit, legal.