Synonyms|288Antonyms|134|Broader|5Narrower|7Related|1.5k
1
unshown
1
unsuccessful(adjective, empty, worthless, frivolous, ineffective)
1
unsupported by evidence(expression, idiom)
1
unsustained
1
untested
1
untried
1
unused
1
unvalidated
1
unwarrantable
1
unwelcome
1
useless(adjective, empty, senseless, worthless, unwarranted)
1
wacky(foolish, unreasonable, irrational, illogical, unreasoned)
1
weak
1
without basis
1
without grounds
1
without substantiation
1
worthless(adjective, empty, senseless, unwarranted, wanton)
0
Jesuitic
0
aberrant(foolish, unreasonable, illogical)
0
abortive(adjective, empty, worthless, frivolous, ineffective)
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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>