| foolish | |
| dumb | |
| silly | |
| insane | |
| idiotic | |
| crazy | |
| slow(adjective, dull) | |
| dull | |
| stupid(adjective, dull) | |
| mad | |
| simple | |
| asinine | |
| fatuous | |
| unintelligent(adjective, dull) | |
| obtuse | |
| numskull | |
| newt | |
| brainless | |
| goofy | |
| irrational |
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| APA | Smart Define. (2015). sage thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/sage/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "sage thesaurus" https://smartdefine.org/sage/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, sage thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/sage/thesaurus/antonyms>. |
| MLA | Smart Define. "sage thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/sage/thesaurus/antonyms> |