7
unverifiable(adjective, true, real)
5
indemonstrable(adjective, true, real)
2
unsustainable(adjective, true, real)
2
capricious
2
unsupportable(adjective, true, real)
1
agnostic
1
ambiguous
1
chancy
1
changeable
1
controvertible
1
debatable(adjective, true, real)
1
dicey
1
disprovable(adjective, true, real)
1
disputable(adjective, true, real)
1
doubting
1
equivocal
1
erratic
1
fickle
1
hesitant
1
hesitating
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APASmart Define. (2015). unprovable thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/unprovable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unprovable thesaurus" https://smartdefine.org/unprovable/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, unprovable thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/unprovable/thesaurus/synonyms>.
MLASmart Define. "unprovable thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/unprovable/thesaurus/synonyms>