| oafish(adjective, dull, simple, slow, stupid) | |
| reticent(adjective, close, quiet, soft, low) | |
| ridiculous(adjective, foolish, impractical, unintelligent, half-baked) | |
| wacky | |
| opaque(adjective, dull, silly, foolish, stupid) | |
| soundless(adjective, close, quiet, soft, low) | |
| addle-pated | |
| beaglebrained(adjective, stupid) | |
| bleak | |
| closemouthed(quiet, soft, still, reticent, silent) | |
| cretinous(adjective, foolish) | |
| cushion-witted(adjective, stupid) | |
| dimmed | |
| empty(adjective, ineffective, fruitless) | |
| fat(adjective, silly, stupid, green, thick) | |
| halfwitted | |
| inaudible(adjective, close, quiet, soft, low) | |
| inert(adjective, dull, heavy, stupid, impassive) | |
| insensate(adjective, dull, simple, slow, informal) | |
| irrational |
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| APA | Smart Define. (2016). dumb thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/dumb/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "dumb thesaurus" https://smartdefine.org/dumb/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, dumb thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/dumb/thesaurus/synonyms>. |
| MLA | Smart Define. "dumb thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/dumb/thesaurus/synonyms> |