Synonyms of illicit

illicit

adjective

(ˌ)i(l)-ˈli-sət 

as in illegal

contrary to or forbidden by law

had a long history of using illicit drugs

Synonyms & Similar Words

• illegal
• unlawful
• criminal
• felonious
• unauthorized
• wrongful
• forbidden
• illegitimate
• prohibited
• lawless
• immoral
• sinful
• criminalized
• evil
• unethical
• shameful
• wrong
• wicked
• unsanctioned
• bad
• unlicensed
• contraband
• reprehensible
• proscribed
• under-the-table
• outlawed
• unscrupulous
• blameworthy
• corrupt
• discouraged
• barred
• disallowed
• censurable
• interdicted
• banned
• villainous
• unprincipled
• under-the-counter
• bootleg
• blamable
• adulterine

Antonyms & Near Antonyms

• legal
• legitimate
• lawful
• good
• ethical
• right
• permitted
• righteous
• virtuous
• just
• authorized
• principled
• licensed
• approved
• endorsed
• proper
• correct
• allowed
• promoted
• supported
• sanctioned
• decent
• suggested
• encouraged
• abetted
• decorous
• seemly

Example Sentences

Recent Examples of illicit

Experts say it is being used as a cutting agent, added to other illicit drugs, without the buyer's knowledge. — Marissa Sulek, CBS News, 13 July 2026

An ‘illicit relationship’ John Cotham met Yaffe at Gold’s Gym in 2008, according to Yaffe’s counterclaim. — Amber Gaudet, Charlotte Observer, 10 July 2026

The state does offer two black plates, but a third, illicit version has been spotted on the roads. — Bay Area News Group, Mercury News, 9 July 2026

With more people under the influence of alcohol, an expanding illicit drug market and more guns available, the murder rate dramatically increased. — James Tuttle, The Conversation, 9 July 2026