- Definitions|1
- Thesaurus|2.6k
- Abbreviations|0
| doltish(weak, simple, silly, foolish, thoughtless) | |
| dopey(adjective, knowledge, slang, ability) | |
| doubtful(extraordinary, amazing, dubious, astonishing, incredible) | |
| dubious(extraordinary, amazing, astonishing, incredible) | |
| dumb(foolish, crazy, impulsive, insane, unintelligent) | |
| eccentric(adjective, keen, warm, wild, strange) | |
| empty | |
| empty headed(expression, idiom) | |
| erratic(adjective, careless, wild, silly, foolish) | |
| fanciful | |
| fantasied | |
| fantastical | |
| far-fetched(extraordinary, amazing, incredible) | |
| feckless(careless, wild, immoral, thoughtless, negligent) | |
| feebleminded(weak, simple, silly, foolish, thoughtless) | |
| fickle(adjective, careless, excited, foolish, unstable) | |
| fiery(careless, thoughtless, impulsive, reckless, hasty) | |
| fire-eating | |
| flimsy(extraordinary, amazing, incredible) | |
| fluttery |
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| APA | Smart Define. (2015). harebrained thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/harebrained/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "harebrained thesaurus" https://smartdefine.org/harebrained/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, harebrained thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/harebrained/thesaurus/synonyms>. |
| MLA | Smart Define. "harebrained thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/harebrained/thesaurus/synonyms> |