151 entries under foolish topic. ×

1
short-sighted(weak, simple, silly, fantastic)
1
simple(weak, silly, thoughtless, unwise)
1
strange(silly, fantastic, unwise, impractical)
1
touched(adjective, wild, silly, stupid)
1
unintelligent(weak, simple, silly, crazy)
1
unusual(adjective, keen, warm, silly)
1
unworkable(silly, fantastic, unwise, impractical)
1
weak(simple, extraordinary, silly, thoughtless)
1
weird(silly, fantastic, unwise, impractical)
0
ape(silly, unwise)
0
bats in the belfry(expression, idiom, silly, unwise)
0
bedlamite(adjective, keen, warm, silly)
0
berserk(silly, unwise)
0
beyond reason(expression, fantastic, unrealistic)
0
bonkers(silly, unwise)
0
buggy(adjective, silly, crazy, mad)
0
crazed(adjective, wild, silly, stupid)
0
cuckoo(silly, unwise)
0
demented(adjective, wild, silly, crazy)
0
dingy(silly, unwise)
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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>