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

There’s some evidence and many anecdotes that kratom leaf products have helped people wean themselves off of opioids or other illicit drugs. — Theresa Gaffney, STAT, 30 Sep. 2026

Meanwhile, prisoners increasingly end up spending more time in their cells, with less access to rehabilitative programs and more incentive to pass the time taking illicit drugs. — Issy Ronald, CNN Money, 30 Sep. 2026

For decades, the illicit distribution and use of opioids has become an increasing public health problem. — New Atlas, 30 Sep. 2026

Interior Minister Kipchumba Murkomen oversaw the destruction and warned drug traffickers that authorities would step up efforts to disrupt the illicit trade. — ABC News, 24 Sep. 2026