Synonyms|155Antonyms|100|Broader|0Narrower|0Related|1.3k
9
groundless(adjective, reason, unwarranted, untrue, justification)
8
baseless(adjective, substantiation)
8
unsubstantiated(adjective, unwarranted, untrue, flimsy, questionable)
7
unfounded(adjective, unwarranted, untrue, flimsy, unsubstantiated)
6
shaky(adjective, doubtful, questionable)
6
unassisted(adjective, weakness)
6
unwarranted
5
idle(adjective, false, unwarranted, justification, unsubstantiated)
5
unaided(adjective, weakness)
5
unconfirmed(adjective, unwarranted, untrue, flimsy, unsubstantiated)
5
uncorroborated
5
unproven(adjective, unsubstantiated, groundless, unconfirmed, uncorroborated)
5
unsound
4
doubtful(adjective, questionable, unsubstantiated, unconfirmed, uncorroborated)
4
unjustified
3
dubious(adjective, questionable, unsubstantiated, unconfirmed, uncorroborated)
3
flimsy(adjective, false, unwarranted, untrue, justification)
3
invalid
3
single-handed
3
speculative
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APASmart Define. (2015). unsupported thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/unsupported/thesaurus/synonyms
ChicagoSmart Define. 2015. "unsupported thesaurus" https://smartdefine.org/unsupported/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, unsupported thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/unsupported/thesaurus/synonyms>.
MLASmart Define. "unsupported thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/unsupported/thesaurus/synonyms>