- Definitions|2
- Thesaurus|292
- Abbreviations|0
| illegal(adjective, prohibition) | |
| contraband(adjective, prohibition, forbidden) | |
| illicit | |
| intolerable(adjective, outrageous) | |
| prohibited | |
| banned(adjective, forbidden) | |
| forbidden(adjective, allow) | |
| inadmissible | |
| taboo(adjective, allow, informal, forbidden) | |
| unauthorized | |
| verboten(adjective, allow, forbidden) | |
| illegitimate | |
| outlawed | |
| proscribed(adjective, forbidden) | |
| unbearable | |
| unlawful | |
| unmentionable(adjective, unspeakable) | |
| unwarrantable(adjective, outrageous, intolerable) | |
| criminal | |
| inexcusable(adjective, forgivable) |
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| APA | Smart Define. (2015). impermissible thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/impermissible/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "impermissible thesaurus" https://smartdefine.org/impermissible/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, impermissible thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/impermissible/thesaurus/synonyms>. |
| MLA | Smart Define. "impermissible thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/impermissible/thesaurus/synonyms> |