from
The Collaborative International Dictionary of English v.0.48
Irrefragable \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; 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]