93 entries under careless topic. ×

9
frivolous(adjective, ability, excited, silly)
9
dizzy(adjective, slang, ability, excited)
9
foolish(adjective, weak, simple, knowledge, ability)
8
flighty(adjective, ability, excited, silly)
7
empty-headed(adjective, ability, silly, foolish)
6
foolhardy(adjective, foolish, fantastic, thoughtless)
6
giddy(adjective, ability, excited, silly)
6
rash(adjective, wild, silly, foolish)
6
scatterbrained(adjective, ability, silly, foolish)
5
featherbrained(adjective, ability, silly, foolish)
5
gaga(adjective, ability, informal, foolish)
5
inane(adjective, silly, foolish, stupid)
5
madcap(noun, adjective, wild, silly)
5
reckless(adjective, wild, silly, foolish)
5
thoughtless(wild, crazy, vague, impulsive)
5
wild(adjective, foolish, fantastic, thoughtless)
4
adventurous(adjective, wild, bold, thoughtless)
4
heedless(adjective, wild, silly, stupid)
3
brainless(adjective, weak, simple, silly)
3
imprudent(adjective, weak, simple, wild)
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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>