unprovable
Definitions
Impossible to demonstrate or verify as true through evidence or logical argument.
Not capable of being proven or substantiated.
Examples
The theory remains scientifically unprovable due to the lack of observable data.
He made an unprovable claim about his past that left everyone feeling skeptical.
Synonyms
indemonstrable unverifiable undemonstrable unsubstantiable beyond proof
Antonyms
provable verifiable demonstrable substantiable capable of being proven