Synonyms|288Antonyms|134|Broader|5Narrower|7Related|1.5k
2
implausible(adjective, poor, irrational, unconvincing, unreasoned)
2
irrelevant(adjective, false, unreasonable, empty, senseless)
2
light
2
loose
2
needless(adjective, useless, unwarranted, unnecessary, wanton)
2
not following(expression, idiom, reasoning)
2
null and void
2
superstitious(adjective, superstition)
2
unattested
2
uncivilised
2
undue
2
unreal(adjective, error)
2
untrue(adjective, error)
2
wilful
1
alleged
1
built on sand(expression, idiom)
1
captious
1
casuistic
1
deceptive
1
defective
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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>