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

The public implosion of illicit-finance talks Tuesday suggests otherwise. — Eleanor Mueller, semafor.com, 29 July 2026

The order also prioritized funding for states and cities that ban urban camping, urban squatting and open illicit drug use. — Aaron Navarro, CBS News, 29 July 2026

Recently, cartels have been a major force behind illicit logging in the forests that Álvarez Alcalá and his son have tried to revive and protect, and much of the land has been converted for avocado farming. — Vann R. Newkirk Ii, The Atlantic, 28 July 2026

Anthropic, which is valued at close to $1 trillion and has aspirations of going public in the near future, said stopping illicit distillation was a matter of national security. — Kif Leswing,jonathan Vanian, CNBC, 25 July 2026