See illicit in Webster's New World Roget's A-Z Thesaurus II
adjective
Contrary to accepted, especially moral conventions:
unlawful. See rightProhibited by law:
illegal, illegitimate, lawless, outlawed, unlawful, wrongful. See crimes, lawOf, involving, or being a crime:
criminal, illegal, illegitimate, lawless, unlawful, wrongful. See crimes
Learn more about illicit