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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Rather than being stripped of their parts, this term refers to vehicles that are driven off intact by thieves, either for joy-riding or title washing and illicit resale either here or abroad.—Jim Gorzelany, Forbes.com, 7 Aug. 2025 Grab a seat at Square Grouper, where illicit Florida Keys history blends with the freshest seafood and stellar sunset views.—Carrie Honaker, Travel + Leisure, 5 Aug. 2025 Death rates shot up in 2020 and 2021 as COVID-19 and an increasingly dangerous illicit drug supply took out Coloradans at rates not seen in decades.—Meg Wingerter, Denver Post, 2 Aug. 2025 When Lebanese depositors were locked out of their savings in 2019 after a financial meltdown crippled the country and its currency, Hezbollah remained able to fund its base and illicit activities.—Natasha Turak,emma Graham, CNBC, 29 July 2025 See All Example Sentences for illicit
Word History
Etymology
Latin illicitus, from in- + licitus lawful — more at licit
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