English Reference

Word

illicit

Phoneticsil·lic·it, stress on the second syllable

US/ˌɪˈɫɪsət/

UK/ɪlˈɪsɪt/

Definitions

01illegal

C1 · Advanced Law Formal

adj. not allowed by law.

adj. forbidden by law, rules, or custom; often used to describe trade or activities that are hidden from authorities.

“The police are trying to stop the illicit trade of stolen goods.”

“The investigation uncovered a vast network involved in the illicit trafficking of protected wildlife across international borders.”

Usage

Commonly collocates with nouns like 'trade', 'drugs', 'activities', or 'gains'.

Antonyms

02socially disapproved

C2 · Proficiency Formal · Literary

adj. not allowed by social rules or morals, even if not strictly against the law.

adj. contrary to accepted social or ethical standards; often used in the context of secret relationships.

“They had an illicit romance that they kept secret from their families.”

“The novel explores the tragic consequences of their illicit affair within the rigid social structure of the nineteenth century.”

03illegal items

C2 · Proficiency Plural noun Law Technical · Formal

n. things that are illegal to own or sell.

n. substances or goods that are prohibited by law.

“Customs officers searched the ship for any illicits hidden in the cargo.”

“The new legislation aims to tighten controls on the sale of chemical precursors used to manufacture various illicits.”

Synonyms

contrabandprohibited goods

Collocations

Common phrases and expressions where native English speakers use the word “illicit” in context.

01. illicit drugs

Confusables

illicit vs elicit

Elicit is a verb meaning to draw out a response; illicit is an adjective meaning illegal or forbidden.

RememberElicit = Extract a reaction. Illicit = Illegal.

Real-World Examples

“He was prescribed pregabalin to treat his anxiety, but his mother says he "became addicted" and started boosting his supply by buying the drug from illicit websites.”
BBC News 18 Aug 2026
“This is compounded when illicit commercial industries, known as the “education mafia”, exploit student desperation by stealing and then selling exam papers, something that has become widespread in India and elsewhere.”
The Guardian 16 Aug 2026
“The shipments were headed by land across the Afghanistan-West Asia corridor, where the illicit drugs typically travel through Türkiye en route to Europe.”
UN News 14 Aug 2026
“Criminal networks now draw revenue from illicit and legal sources alike.”
The Conversation 10 Aug 2026

Etymology

Borrowed from French illicite, from Latin illicitus, from in- (“not”) + licitus (“allowed, permitted”), from licet (“it is allowed”). By surface analysis, il- + licit.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Domain

Law

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.C1 AdvancedIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.7.0–8.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 5.0–5.595–113TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.945–990
Frequency
Frequent
Level
C1 · Advanced
Updated

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English Reference