unsubstantiable

Definitions

Not capable of being proven true or supported by evidence.

Lacking sufficient facts or data to be verified or validated.

Examples

The witness provided a series of unsubstantiable claims that failed to hold up under cross-examination.

Because the theory remains entirely unsubstantiable, the scientific community has decided to withhold further funding for the project.

Synonyms

unprovable indefensible unverifiable baseless groundless unsupported

Antonyms

provable verifiable demonstrable substantiable well-founded supportable