- Definitions|2
- Thesaurus|2k
- Abbreviations|0
| feather-brained | |
| flaky(foolish, unreasonable, illogical) | |
| flighty(adjective, simple, careless, foolish, stupid) | |
| futile(dull, unintelligent, witless) | |
| gormless | |
| halfwitted | |
| hare-brained | |
| indiscreet(adjective, dull, weak, simple, silly) | |
| jackass(noun, adjective, foolish) | |
| kooky(weak, simple, silly, foolish, unreasonable) | |
| laughable(adjective, dull, unintelligent, witless) | |
| lumpish | |
| nitwit(noun, adjective, foolish) | |
| nitwitted(adjective, simple, silly, foolish, stupid) | |
| not bright(expression, adjective, simple, slow, stupid) | |
| pea-brained | |
| pointless(dull, silly, foolish, stupid, absurd) | |
| preposterous(adjective, weak, simple, silly, foolish) | |
| rash(adjective, dull, silly, thoughtless, unwise) | |
| rattle-brained |
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| APA | Smart Define. (2016). brainless thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/brainless/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "brainless thesaurus" https://smartdefine.org/brainless/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2016, brainless thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/brainless/thesaurus/synonyms>. |
| MLA | Smart Define. "brainless thesaurus" 24 March 2016. Web. 20 September 2026. <https://smartdefine.org/brainless/thesaurus/synonyms> |