illicit

adjective

il·​lic·​it (ˌ)i(l)-ˈli-sət 

: not permitted : unlawful

illicitly adverb

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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.

Synonyms

• criminal
• felonious
• illegal
• illegitimate
• lawless
• unlawful
• wrongful

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

For various examples and further detailed indications about the nature of what is considered illicit prompts (i.e., that you aren’t supposed to use), see my coverage at the link here. —Lance Eliot, Forbes.com, 9 Apr. 2025

Meanwhile, smugglers and bad actors are perpetually advancing their methods for disguising illicit goods, unsafe products and narcotics. —Kate Nishimura, Sourcing Journal, 8 Apr. 2025

Established in 2022 under former President Joe Biden, the National Cryptocurrency Enforcement Team was tasked with addressing the illicit use of cryptocurrencies. —Mackenzie Sigalos, CNBC, 8 Apr. 2025

In a memo sent Monday night, Blanche directed the closure of the National Cryptocurrency Enforcement Team and ordered prosecutors to pivot to investigating transnational criminal organizations and terrorist groups that use crypto to engage in illicit transactions. —Josh Meyer, USA Today, 8 Apr. 2025

Word History

Etymology

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

First Known Use

1506, in the meaning defined above

Rhymes for illicit

• complicit
• elicit
• explicit
• implicit
• solicit
• licit

Kids Definition

illicit

adjective

il·​lic·​it (ˈ)il-ˈ(l)is-ət 

: illegal

illicit drug traffic

illicitly adverb

Legal Definition

illicit

adjective

il·​lic·​it il-ˈli-sət 

: not permitted : unlawful

an illicit motive to defeat or evade the taxes

—In re Haas, 48 F.3d 1153 (1995)