a. [ F. irréfragable, L. irrefragabilis. See Refragable. ] Not refragable; not to be gainsaid or denied; not to be refuted or overthrown; irrefutable; unanswerable; incontestable; undeniable; as, an irrefragable argument; irrefragable evidence. -- Ir*ref"ra*ga*ble*ness, n. -- Ir*ref"ra*ga*bly, adv.

Syn. -- Incontrovertible; unanswerable; indisputable; unquestionable; incontestable; indubitable; undeniable; irrefutable. [ 1913 Webster ]

a. [ LL. refragabilis, fr. L. refragari to oppose. ] Capable of being refuted; refutable. [ R. ] -- Ref"ra*ga*ble*ness, n. [R.] -- Ref`ra*ga*bil"i*ty n. [ R. ] [ 1913 Webster ]