| tabooed | |
| tabu | |
| unallowed | |
| unconstitutional(adjective, illegal) | |
| under the ban(expression, idiom) | |
| under the table(expression, adjective, irregular, unwarranted, criminal) | |
| unjust(adjective, illegal) | |
| unpermissible | |
| untouchable | |
| unwarrantable(irregular, unwarranted, criminal, illegal, illegitimate) | |
| unwarranted | |
| vetoed | |
| against the law | |
| ban | |
| beyond the pale(expression, idiom, prohibition) | |
| contrary to law(expression, idiom, illegal, illicit) | |
| disallowed | |
| in violation of law(expression, idiom, illegal, illicit) | |
| indictable(illegal, illicit, unsanctioned, unapproved) | |
| interdicted |
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| APA | Smart Define. (2015). unlicensed thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unlicensed/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unlicensed thesaurus" https://smartdefine.org/unlicensed/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, unlicensed thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unlicensed/thesaurus/synonyms>. |
| MLA | Smart Define. "unlicensed thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/unlicensed/thesaurus/synonyms> |