| false(adjective, open, sound, right, wrong) | |
| invalid(adjective, false, worthless, illegal, unfounded) | |
| less important | |
| unconvincing | |
| expired | |
| unreal(adjective, false, illegal) | |
| unsound(adjective, strong, sound, false, well) | |
| wrong(adjective, false, illegal) | |
| fallacious | |
| absurd | |
| illegitimate(adjective, false, illegal) | |
| illogical | |
| insane | |
| null(adjective, ineffectual, valueless) | |
| nutty | |
| preposterous | |
| void(adjective, meaningless, nullified) | |
| crazy | |
| fake(adjective, false, illegal) | |
| specious(adjective, misleading) |
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| APA | Smart Define. (2016). valid thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/valid/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "valid thesaurus" https://smartdefine.org/valid/thesaurus/antonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2016, valid thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/valid/thesaurus/antonyms>. |
| MLA | Smart Define. "valid thesaurus" 31 March 2016. Web. 20 September 2026. <https://smartdefine.org/valid/thesaurus/antonyms> |