23
baseless(adjective, reason, poor, foolish, true)
20
unfounded(adjective, reason, foolish, true, crazy)
18
unjustifiable(adjective, careless, unwarranted, defended, verbal attack)
17
unwarranted(adjective, right, reasonable, reason, true)
15
unsound(adjective, foolish, unreasonable, error, reasoning)
12
idle(adjective, reason, false, true, worthless)
12
illogical(adjective, reason, poor, foolish, sense)
12
unjustified(adjective, reason, unwarranted, untrue, justification)
10
unreasonable(adjective, poor, foolish, reasoning, irrational)
10
wanton(adjective, careless, cruel, unwarranted, malicious)
9
false(adjective, reason, poor, error, reasoning)
9
unsupported(adjective, reason, unwarranted, untrue, justification)
8
gratuitous(adjective, reason, useless, unwarranted, untrue)
8
untenable(adjective, reasoning, defended, verbal attack)
7
flimsy(adjective, reason, poor, negative, unwarranted)
7
ungrounded(adjective, poor, negative, error, unwarranted)
7
unsustainable(adjective, defended, verbal attack)
6
empty(adjective, reason, negative, worthless, unwarranted)
6
fallacious(adjective, poor, foolish, unreasonable, error)
6
indefensible(adjective, senseless, unwarranted, wanton, gratuitous)
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APASmart Define. (2015). groundless thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/groundless/thesaurus/synonyms
ChicagoSmart Define. 2015. "groundless thesaurus" https://smartdefine.org/groundless/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, groundless thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/groundless/thesaurus/synonyms>.
MLASmart Define. "groundless thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/groundless/thesaurus/synonyms>