100 entries under silly topic. ×

1
harebrained(adjective, careless, wild, foolish)
1
heedless(adjective, careless, unsteady, frivolous)
1
idiotic(foolish, mad, insane, unwise)
1
inane(foolish, unwise)
1
ludicrous(foolish, unwise)
1
lunatic(adjective, wild, foolish, crazy)
1
maniacal(foolish, mad, insane, unwise)
1
mental(foolish, mad, insane, unwise)
1
moonstruck(foolish, mad, insane, unwise)
1
nonsensical(foolish, stupid, senseless, irrational)
1
off the wall(expression, adjective, idiom, unusual, strange)
1
preposterous(adjective, wrong, wild, strange)
1
ridiculous(unusual, strange, foolish, unwise)
1
schizo(foolish, mad, insane, unwise)
1
stupid(foolish, senseless, irrational, unwise)
1
touched(unusual, strange, foolish, mad)
1
unglued(foolish, mad, unstable, insane)
1
unhinged(unusual, strange, foolish, mad)
1
unzipped(foolish, mad, insane, unwise)
1
way out(expression, adjective, extraordinary, unusual, strange)
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APASmart Define. (2016). erratic thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/erratic/thesaurus/synonyms
ChicagoSmart Define. 2016. "erratic thesaurus" https://smartdefine.org/erratic/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, erratic thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/erratic/thesaurus/synonyms>.
MLASmart Define. "erratic thesaurus" 26 February 2016. Web. 22 September 2026. <https://smartdefine.org/erratic/thesaurus/synonyms>