unattestable

Adjective

not-comparable

That cannot be attested.

Japanese Meaning

立証できない / 証明できない

Because the source documents were lost and eyewitness accounts contradicted each other, the committee concluded the claim was unattestable.

出所の文書が失われ目撃者の証言が互いに矛盾していたため、委員会はその主張は証明できないと結論付けた。

Sense（1）

That cannot be attested.