Synonyms of illicit
1
: not permitted : unlawful, illegal
illicit drugs/substances
illicit profits
2
: involving activities that are not considered morally acceptable
illicit sex
… particularly because she was suspected of having illicit affairs.David S. Reynolds
illicitly adverb

Did you know?

Illicit and Elicit

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.

Examples of illicit in a Sentence

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, 1999
The 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.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
These songs felt a little like that—a way to peer into other people’s affairs, knowing just enough to feel the illicit thrill of some faraway tryst. Grayson Haver Currin, Pitchfork, 30 Aug. 2026 Deli containers, those clear plastic cylinders that hold bagel schmears, premade pasta salads, and the occasional illicit public beach cocktail, enjoy vaunted status in the food world. Wilder Davies, Bon Appetit Magazine, 28 Aug. 2026 The Lake County State's Attorney said an investigation starting in June 2026 found illicit activity on a peer-to-peer file-sharing network. Elyssa Kaufman, CBS News, 27 Aug. 2026 The last time Jose Javier Rodriguez was up for election, an illicit spoiler campaign pushed him out of office by just a few dozen votes. Romy Ellenbogen Herald, Miami Herald, 26 Aug. 2026 See All Example Sentences for illicit

Word History

Etymology

Latin illicitus, from in- + licitus lawful — more at licit

First Known Use

1623, in the meaning defined at sense 1

Time Traveler
The first known use of illicit was in 1623

Browse Nearby Words

Cite this Entry

“Illicit.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/illicit. Accessed 1 Sep. 2026.

Kids Definition

illicit

adjective
: illegal
illicit drug traffic
illicitly adverb

Legal Definition

illicit

adjective
: not permitted : unlawful
an illicit motive to defeat or evade the taxesIn re Haas, 48 F.3d 1153 (1995)
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!