| illegal(adjective, illegal, illegitimate, prohibition, pirate) | |
| unauthorized(adjective, illegal, prohibition) | |
| illicit(adjective, irregular, unwarranted, criminal, legal) | |
| unlawful(adjective, illegal) | |
| unaccredited | |
| unlicenced | |
| verboten(adjective, illegal) | |
| contraband | |
| forbidden(adjective, illegal) | |
| criminal(adjective, irregular, unwarranted, illegal, illegitimate) | |
| illegitimate(adjective, illegal) | |
| impermissible | |
| lawless(adjective, illegal) | |
| outlawed(adjective, irregular, unwarranted, criminal, illegal) | |
| prohibited(adjective, prohibition) | |
| taboo(adjective, illegal) | |
| unauthorised | |
| unsanctioned | |
| banned | |
| bootleg(adjective, illegal) |
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| APA | Smart Define. (2015). unlicensed thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/unlicensed/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unlicensed thesaurus" https://smartdefine.org/unlicensed/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, unlicensed thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/unlicensed/thesaurus/synonyms>. |
| MLA | Smart Define. "unlicensed thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/unlicensed/thesaurus/synonyms> |