118 entries under careless topic. ×

11
indiscreet(adjective, dull, weak, simple, offensive)
10
impolitic(adjective, wrong, stupid, thoughtless)
10
incautious(adjective, weak, simple, silly)
10
reckless(adjective, silly, stupid, crazy)
10
scatterbrained(silly, stupid, trivial, unthinking)
10
unthinking(adjective, dull, simple, wrong, slight)
9
harebrained(adjective, weak, simple, knowledge, ability)
9
irresponsible(adjective, silly, stupid, fantastic)
9
vacuous(adjective, indifferent, silly, stupid)
8
empty-headed(adjective, slight, indifferent, silly)
8
heedless(adjective, wild, silly, stupid)
8
outrageous(adjective, rough, wild, strange)
6
flighty(adjective, simple, slight, silly)
6
giddy(adjective, simple, rough, silly)
6
hasty(adjective, impulsive, rash, risky)
6
impetuous(adjective, rough, crazy, thoughtless)
6
inept(stupid, rash, risky, unthinking)
6
madcap(adjective, rough, silly, crazy)
6
obtuse(adjective, dull, simple, silly)
5
barmy(adjective, silly, stupid, trivial)
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APASmart Define. (2016). foolish thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/foolish/thesaurus/synonyms
ChicagoSmart Define. 2016. "foolish thesaurus" https://smartdefine.org/foolish/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, foolish thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/foolish/thesaurus/synonyms>.
MLASmart Define. "foolish thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/foolish/thesaurus/synonyms>