| felonious(adjective, illegal) | |
| not permitted(expression, idiom, prohibition) | |
| wrongful(adjective, illegal) | |
| actionable(adjective, illegal) | |
| barred | |
| black-market(irregular, unwarranted, criminal, illegal, illegitimate) | |
| extralegal(irregular, unwarranted, criminal, illegal, illegitimate) | |
| forbade | |
| forbid | |
| nonpermissible | |
| not approved(expression, irregular, unwarranted, criminal, illegal) | |
| not legal(expression, irregular, unwarranted, criminal, illegal) | |
| off limits | |
| offensive(adjective, illegal) | |
| out of bounds(expression, idiom) | |
| out of line(expression, idiom, illegal, illicit, unsanctioned) | |
| outside the law(expression, irregular, unwarranted, criminal, illegal) | |
| punishable(adjective, illegal) | |
| racket(irregular, unwarranted, criminal, illegal, illegitimate) | |
| ruled out |
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| APA | Smart Define. (2015). unlicensed thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/unlicensed/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unlicensed thesaurus" https://smartdefine.org/unlicensed/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, unlicensed thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/unlicensed/thesaurus/synonyms>. |
| MLA | Smart Define. "unlicensed thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/unlicensed/thesaurus/synonyms> |