65 entries under stupid topic. ×

17
crazy(adjective, weak, simple, knowledge, ability)
14
silly(adjective, weak, simple, knowledge, ability)
12
insane(adjective, weak, simple, knowledge, ability)
9
frivolous(adjective, ability, careless, excited, silly)
9
dizzy(adjective, slang, ability, careless, excited)
9
foolish(adjective, weak, simple, knowledge, ability)
8
flighty(adjective, ability, careless, excited, silly)
8
mad(adjective, weak, simple, knowledge, ability)
7
absurd(adjective, weak, simple, knowledge, ability)
7
empty-headed(adjective, ability, careless, silly, foolish)
7
loony(adjective, weak, simple, knowledge, ability)
7
preposterous(adjective, weak, great, simple, knowledge)
6
giddy(adjective, ability, careless, excited, silly)
6
rash(adjective, careless, wild, silly, foolish)
5
balmy(adjective, knowledge, slang, ability, wild)
5
dippy(adjective, weak, simple, knowledge, slang)
5
featherbrained(adjective, ability, careless, silly, foolish)
5
idiotic(adjective, weak, simple, knowledge, ability)
5
inane(adjective, careless, silly, foolish)
5
reckless(adjective, careless, wild, silly, foolish)
11 years ago|16k views|share |citing 
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>