unverifiable
adjective
un·ver·i·fi·able
ˌən-ˌver-ə-ˈfī-ə-bəl
: unable to be confirmed or verified
an unverifiable rumor
… he told me stories that were so wild and unverifiable I didn't know what to say.—Ian Frazier
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Merriam-Webster unabridged
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