- Definitions|0
- Thesaurus|147
- Abbreviations|0
| dimwit | |
| dummy | |
| eccentric(noun, crazy, loony) | |
| failure(bungler, bumbler, fumbler) | |
| fanatic(noun, crazy, loony, dingbat, ultraist) | |
| fiend(noun, crazy, loony) | |
| foulup(fool, incompetent, butcher, bungler, bumbler) | |
| freak(noun, crazy, loony) | |
| fruitcake(fanatic, lamebrain, schizoid, dingbat, ultraist) | |
| has-been(bungler, bumbler, fumbler) | |
| has been(expression, bungler, bumbler, fumbler) | |
| innovativeness(fanatic, dingbat, ultraist) | |
| loon(fanatic, dingbat, ultraist) | |
| loony(noun, crazy, lamebrain, schizoid, dingbat) | |
| madman | |
| madwoman(fanatic, lamebrain, schizoid, dingbat, ultraist) | |
| might-have-been(bungler, bumbler, fumbler) | |
| modernity(fanatic, dingbat, ultraist) | |
| monomaniac(fanatic, dingbat, ultraist) | |
| moron |
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| APA | Smart Define. (2015). harebrain thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/harebrain/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "harebrain thesaurus" https://smartdefine.org/harebrain/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, harebrain thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/harebrain/thesaurus/synonyms>. |
| MLA | Smart Define. "harebrain thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/harebrain/thesaurus/synonyms> |