45 entries under foolish topic. ×

23
baseless(adjective, reason, poor, true)
20
unfounded(adjective, reason, true, crazy)
15
unsound(adjective, unreasonable, error, reasoning)
12
illogical(adjective, reason, poor, sense)
10
unreasonable(adjective, poor, reasoning, irrational)
6
fallacious(adjective, poor, unreasonable, error)
4
absurd(adjective, unreasonable, irrational, illogical)
4
invalid(unreasonable, reasoning, irrational, illogical)
4
irrational(adjective, unreasonable, illogical, defended)
4
ridiculous(adjective, unreasonable, illogical, defended)
4
sophistic(adjective, unreasonable, irrational, illogical)
4
specious(adjective, unreasonable, irrational, illogical)
2
crazy(unreasonable, illogical)
1
mad(unreasonable, irrational, illogical, unreasoned)
1
nutty(unreasonable, irrational, illogical, unreasoned)
1
preposterous(unreasonable, irrational, illogical, unreasoned)
1
reasonless(adjective, crazy, unreasonable, senseless)
1
senseless(unreasonable, irrational, illogical, unreasoned)
1
wacky(unreasonable, irrational, illogical, unreasoned)
0
aberrant(unreasonable, illogical)
<123>
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APASmart Define. (2015). groundless thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/groundless/thesaurus/synonyms
ChicagoSmart Define. 2015. "groundless thesaurus" https://smartdefine.org/groundless/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, groundless thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/groundless/thesaurus/synonyms>.
MLASmart Define. "groundless thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/groundless/thesaurus/synonyms>