128 entries under adjective topic. ×

17
crazy(weak, simple, knowledge, ability)
14
silly(weak, simple, knowledge, ability)
12
insane(weak, simple, knowledge, ability)
9
frivolous(ability, careless, excited, silly)
9
dizzy(slang, ability, careless, excited)
9
foolish(weak, simple, knowledge, ability)
8
flighty(ability, careless, excited, silly)
8
goofy(silly, foolish, fantastic, unwise)
8
mad(weak, simple, knowledge, ability)
7
absurd(weak, simple, knowledge, ability)
7
empty-headed(ability, careless, silly, foolish)
7
loony(weak, simple, knowledge, ability)
7
preposterous(weak, great, simple, knowledge)
6
foolhardy(careless, foolish, fantastic, thoughtless)
6
giddy(ability, careless, excited, silly)
6
rash(careless, wild, silly, foolish)
6
scatterbrained(ability, careless, silly, foolish)
5
balmy(knowledge, slang, ability, wild)
5
dippy(weak, simple, knowledge, slang)
5
featherbrained(ability, careless, silly, foolish)
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APASmart Define. (2015). harebrained thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/harebrained/thesaurus/synonyms
ChicagoSmart Define. 2015. "harebrained thesaurus" https://smartdefine.org/harebrained/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, harebrained thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/harebrained/thesaurus/synonyms>.
MLASmart Define. "harebrained thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/harebrained/thesaurus/synonyms>