Illicit, while not exactly an everyday word, is far more common than its antonym, licit ("not forbidden by law, permissible"). Perhaps this is a function of our oft-noted fascination with bad behavior and boredom with rectitude. In any case, illicit may be used of behavior that is either unlawful or immoral. These categories frequently overlap, but they are not always synonymous, as some unlawful activities (illicit cigarette smoking) may not be considered immoral, while some immoral activities (an illicit affair) are not illegal. Illicit is occasionally confused with elicit because of the similarity in their pronunciations, but the two words have decidedly different meanings and functions: in contemporary English, elicit is a verb meaning "to get (a response, information, etc.) from someone," while illicit appears solely as an adjective.
The wedding is mounted in traditional Punjabi style, but underneath the formal fanfare simmer dysfunctional-family tensions, deep dark secrets, … and illicit affairs.—David Ansen, Newsweek, 4 Mar. 2002"Thank you, Lieutenant," she said, bowing her head, just as she might in everyday, civilian life, and I felt suddenly illicit in her presence, as though we'd slipped out of sight of our chaperons …—Chang-rae Lee, A Gesture Life, 1999The companies that carry cellular … have adopted a number of monitoring techniques to detect illicit calls …—Paul Wallich, Scientific American, March 1994
He was arrested for selling illicit copies of the software.
She had an illicit affair with her boss.
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Instead of calling for an expansive probe, however, the president identified just one potential target: ActBlue, the Democrats’ online fundraising juggernaut, which has acknowledged receiving over 200 potentially illicit contributions last year from foreign internet addresses.—Brian Slodysko, Los Angeles Times, 27 May 2025 Wetherell wrote that Trump's justification for the tariffs -- both stemming the flow of illicit drugs into the country and resolving a trade imbalance -- is sufficient to satisfy the terms set by Congress.—Peter Charalambous, ABC News, 23 May 2025 Several former attendees have alleged that his parties had a reputation for taking a more illicit turn after a certain hour or in areas only certain guests could access.—Jennifer Zhan, Vulture, 22 May 2025 Parents, experts and lawmakers have urged tech giants to do more to prevent the sale of counterfeit or illicit drugs to young people through their platforms, after multiple teens have died of overdoses from pills bought online.—Clare Duffy, CNN Money, 22 May 2025 See All Example Sentences for illicit
Word History
Etymology
Latin illicitus, from in- + licitus lawful — more at licit
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