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 many years, China has been the largest source of both legal supplies of the drug – which is prescribed for severe pain relief – and illicit supplies of precursor chemicals that are typically processed in labs in Mexico before the final product is smuggled across the US border. —Rhea Mogul, CNN Money, 28 Mar. 2025

In March 2025, more than 650,000 fentanyl pills were seized, following a record of $300 million worth of illicit fentanyl taken off the streets since 2023. —Paul Du Quenoy, MSNBC Newsweek, 27 Mar. 2025

The two must find a way to work together, even as the bombshell details of a complicated and illicit romance between them begin to spill out. —Dana Feldman, Forbes.com, 26 Mar. 2025

An Army veteran police officer was killed in a shootout during an operational crackdown on transnational drug trafficking organizations infiltrating illicit drugs into the United States, California officials said Wednesday. —Sarah Rumpf-Whitten, FOXNews.com, 26 Mar. 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)