Irrefragability :: Irrefragability (n.) The quality or state of being irrefragable; incapability of being refuted.
Irrefragable :: Irrefragable (a.) Not refragable; not to be gainsaid or denied; not to be refuted or overthrown; unanswerable; incontestable; undeniable; as, an irrefragable argument; irrefragable evidence..
Refragable :: Refragable (a.) Capable of being refuted; refutable.