unanswerable

Definitions

Impossible to answer or refute.

Not capable of being answered or resolved.

Examples

The philosopher posed an unanswerable question that left the entire audience in deep contemplation.

The mystery of the missing artifact remained an unanswerable puzzle for the investigators.

Synonyms

indisputable irrefutable unassailable incontrovertible conclusive definitive unarguable

Antonyms

debatable disputable questionable refutable contestable uncertain arguable