128 entries under adjective topic. ×

5
gaga(ability, informal, careless, foolish)
5
idiotic(weak, simple, knowledge, ability)
5
inane(careless, silly, foolish, stupid)
5
madcap(noun, careless, wild, silly)
5
reckless(careless, wild, silly, foolish)
5
tomfool(knowledge, ability, foolish)
5
wild(careless, foolish, fantastic, thoughtless)
5
witless(weak, simple, silly, foolish)
4
adventurous(careless, wild, bold, thoughtless)
4
cockeyed(knowledge, ability, informal, extraordinary)
4
half-baked(weak, simple, foolish, stupid)
4
heedless(careless, wild, silly, stupid)
4
nutty(weak, simple, wild, silly)
4
ridiculous(weak, simple, wild, strange)
4
sappy(knowledge, slang, ability)
4
skittish
4
wacky(weak, simple, knowledge, slang)
3
birdbrained(slang, ability, foolish, crazy)
3
brainless(weak, simple, careless, silly)
3
careless(wrong, wild, foolish, stupid)
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APASmart Define. (2015). harebrained thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/harebrained/thesaurus/synonyms
ChicagoSmart Define. 2015. "harebrained thesaurus" https://smartdefine.org/harebrained/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, harebrained thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/harebrained/thesaurus/synonyms>.
MLASmart Define. "harebrained thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/harebrained/thesaurus/synonyms>