142 entries under silly topic. ×

1
unintelligent(weak, simple, foolish, crazy)
1
unusual(adjective, keen, warm, foolish)
1
unworkable(foolish, fantastic, unwise, impractical)
1
weak(simple, extraordinary, foolish, thoughtless)
1
weird(foolish, fantastic, unwise, impractical)
0
ape(foolish, unwise)
0
bats in the belfry(expression, idiom, foolish, unwise)
0
bedlamite(adjective, keen, warm, foolish)
0
berserk(foolish, unwise)
0
bonkers(foolish, unwise)
0
buggy(adjective, foolish, crazy, mad)
0
chaotic(crazy, wacky)
0
crazed(adjective, wild, foolish, stupid)
0
cuckoo(foolish, unwise)
0
demented(adjective, wild, foolish, crazy)
0
dingy(foolish, unwise)
0
enthusiastic(adjective, keen, warm, foolish)
0
flipped(foolish, unwise)
0
flipped out(expression, foolish, unwise)
0
freaked out(expression, foolish, 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>