Synonyms|50Antonyms|0|Broader|0Narrower|0Related|4
1
vain(adjective, false, untrue, illogical, deceptive)
1
without basis(expression, adjective, false, unreasonable, senseless)
0
unsubstantiated(adjective, untrue, illogical, deceptive, unsupported)
0
built on sand(expression, idiom)
0
chimerical
0
deceptive(adjective, false, untrue, illogical, unsubstantiated)
0
erroneous
0
flimsy
0
gratuitous
0
hypothetical
0
idle
0
illogical(adjective, sense)
0
illusory
0
imaginary
0
nonexistent(adjective, real, fictional)
0
not well-founded
0
speculative
0
suppositional
0
tenuous
0
uncalled-for
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APASmart Define. (2015). without foundation thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/without_foundation/thesaurus/synonyms
ChicagoSmart Define. 2015. "without foundation thesaurus" https://smartdefine.org/without_foundation/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, without foundation thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/without_foundation/thesaurus/synonyms>.
MLASmart Define. "without foundation thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/without_foundation/thesaurus/synonyms>