unverifiable

From Wiktionary

Word parts[change]

un- + verifiable

Pronunciation[change]

Adjective[change]

Positive
unverifiable

Comparative
none

Superlative
none

  1. If something is unverifiable, it's not possible to tell if it's true or false. It could be true, it could be false, but there's no way to know for sure which it is.