| bootleg(adjective, legal, illegal, forbidden) | |
| clandestine(adjective, secret, sly, legal, forbidden) | |
| contraband(adjective, legal, unlawful, forbidden, illegality) | |
| furtive(adjective, hidden, legal, fraudulent, forbidden) | |
| taboo(adjective, illegal) | |
| unconstitutional(adjective, illegal, undueness) | |
| against the law(expression, adjective, idiom, wrong, illegal) | |
| immoral(adjective, wrong, wicked, legal, unfaithful) | |
| unsanctioned(adjective, undueness) | |
| black-market(adjective, irregular, unwarranted, criminal, legal) | |
| contrary to law(expression, adjective, idiom, legal, illegal) | |
| dirty(adjective, wrong, informal, wicked, senseless) | |
| impermissible | |
| irregular | |
| punishable(adjective, illegal) | |
| corrupt(adjective, wrong, wicked, criminal, illegal) | |
| dishonest | |
| extramarital | |
| iniquitous(adjective, wrong, wicked, criminal, illegal) | |
| secret |
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| APA | Smart Define. (2015). illicit thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/illicit/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "illicit thesaurus" https://smartdefine.org/illicit/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, illicit thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/illicit/thesaurus/synonyms>. |
| MLA | Smart Define. "illicit thesaurus" 13 April 2015. Web. 21 September 2026. <https://smartdefine.org/illicit/thesaurus/synonyms> |