\Ir*ref"ra*ga*ble\, a. [F. irr['e]fragable, L.
irrefragabilis. See {Refragable}.]
Not refragable; not to be gainsaid or denied; not to be
refuted or overthrown; 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.