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Unprovable
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Thesaurus
agnostic
ambiguous
capricious
chancy
changeable
controvertible
dicey
doubting
equivocal
erratic
fickle
hesitant
hesitating
incalculable
indecisive
indemonstrable
irresolute
polysemous
skeptical
touch-and-go
unaccountable
unattestable
uncertain
unconfirmable
unconvinced
undemonstrable
undemonstratable
undivinable
unforeseeable
unpersuaded
unpredictable
unsubstantiatable
unsupportable
unsure
unsustainable
unverifiable
variable
wavering
whimsical
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