the mind > attention and judgement > testing > refutation, disproof > [adjective] > capable of being refuted > not (4)
Of arguments: Irrefragable, irrefutable. Obsolete. rare.
That cannot be refuted or disproved; incontrovertible, incontestable, indisputable, irrefutable, undeniable. (Said of a statement, argument, etc…
Insoluble; figurative unanswerable, irrefutable.
That cannot be refuted or disproved; incontrovertible, irrefragable.