1
doltish(weak, simple, silly, foolish, thoughtless)
1
dopey(adjective, knowledge, slang, ability)
1
doubtful(extraordinary, amazing, dubious, astonishing, incredible)
1
dubious(extraordinary, amazing, astonishing, incredible)
1
dumb(foolish, crazy, impulsive, insane, unintelligent)
1
eccentric(adjective, keen, warm, wild, strange)
1
empty
1
empty headed(expression, idiom)
1
erratic(adjective, careless, wild, silly, foolish)
1
fanciful
1
fantasied
1
fantastical
1
far-fetched(extraordinary, amazing, incredible)
1
feckless(careless, wild, immoral, thoughtless, negligent)
1
feebleminded(weak, simple, silly, foolish, thoughtless)
1
fickle(adjective, careless, excited, foolish, unstable)
1
fiery(careless, thoughtless, impulsive, reckless, hasty)
1
fire-eating
1
flimsy(extraordinary, amazing, incredible)
1
fluttery
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>