126 entries under foolish topic. ×

4
silly(adjective, weak, simple, wild, strange)
4
unearthly(simple, superior, outstanding, amazing)
4
unreasonable(adjective, weak, simple, silly)
3
balmy(silly, unwise, impractical, half-baked)
3
impracticable(adjective, silly, unwise, impractical)
3
kooky(adjective, weak, simple, unusual, wild)
2
aberrant(strange, new, exceptional, special)
2
flaky(adjective, happy, perfect, unusual, wild)
2
foolhardy(adjective, silly, unwise, impractical)
2
frantic
2
harebrained(weak, simple, silly, thoughtless)
2
loony(weak, simple, silly, thoughtless)
2
lunatic(weak, simple, silly, thoughtless)
2
out of all reason(expression, idiom, silly, half-baked)
2
screwy(adjective, extraordinary, strange, silly)
2
tomfool
2
unstable(adjective, change, continue)
2
unworkable(silly, unwise, romantic, impractical)
1
asinine(weak, simple, silly, thoughtless)
1
barmy(adjective, silly, unwise)
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APASmart Define. (2016). fantastic thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/fantastic/thesaurus/synonyms
ChicagoSmart Define. 2016. "fantastic thesaurus" https://smartdefine.org/fantastic/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, fantastic thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/fantastic/thesaurus/synonyms>.
MLASmart Define. "fantastic thesaurus" 30 March 2016. Web. 27 September 2026. <https://smartdefine.org/fantastic/thesaurus/synonyms>