Not capable of being verified, confirmed, checked or proven.(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "unverifiable" in a sentence
"The world of the unverifiable is the world of the soul, the world of the verifiable is the world of the senses."
"I realize you were commenting from a purely analytical perspective, but I find the term "unverifiable" much more palatable."
"And with 20% of the ballot bags "unverifiable" ... on that latter topic, those ballots would be considered tainted evidence inadmissable in a Court trial since the chain of handling cannot be verified."