adj. 25B6; adjective
illicit drugs : ILLEGAL, unlawful, illegitimate, criminal, felonious; outlawed, banned, forbidden, prohibited, proscribed; unlicensed, unauthorized, unsanctioned; contraband, black-market, bootleg; Law malfeasant.
an illicit love affair : TABOO, forbidden, impermissible, unacceptable, tapu, haram; secret, clandestine.
lawful, legal.