Synonyms|16Antonyms|1|Broader|0Narrower|0Related|0
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bottomless(adjective, unwarranted, untrue, flimsy, unsubstantiated)
1
flimsy(adjective, unwarranted, untrue, unsubstantiated, unfounded)
1
gratuitous(adjective, unwarranted, untrue, flimsy, unsubstantiated)
1
groundless(adjective, unwarranted, untrue, flimsy, unsubstantiated)
1
reasonless(adjective, unwarranted, untrue, flimsy, unsubstantiated)
1
unconfirmed(adjective, unwarranted, untrue, flimsy, unsubstantiated)
1
uncorroborated(adjective, unwarranted, untrue, flimsy, unsubstantiated)
1
unfounded(adjective, unwarranted, untrue, flimsy, unsubstantiated)
1
ungrounded(adjective, unwarranted, untrue, flimsy, unsubstantiated)
1
unjustifiable(adjective, unwarranted, untrue, flimsy, unsubstantiated)
1
unjustified(adjective, unwarranted, untrue, flimsy, unsubstantiated)
1
unsubstantiated(adjective, unwarranted, untrue, flimsy, unfounded)
1
unsupported(adjective, unwarranted, untrue, flimsy, unsubstantiated)
1
untenable(adjective, unwarranted, untrue, flimsy, unsubstantiated)
1
unverified
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unwarranted(adjective, untrue, flimsy, unsubstantiated, unfounded)
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APASmart Define. (1970). without substantiation thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/without_substantiation/thesaurus/synonyms
ChicagoSmart Define. 1970. "without substantiation thesaurus" https://smartdefine.org/without_substantiation/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 1970, without substantiation thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/without_substantiation/thesaurus/synonyms>.
MLASmart Define. "without substantiation thesaurus" 1 January 1970. Web. 21 September 2026. <https://smartdefine.org/without_substantiation/thesaurus/synonyms>