What's the difference between irrefragable and refragable?

Irrefragable

Definition:

• (a.) Not refragable; not to be gainsaid or denied; not to be refuted or overthrown; unanswerable; incontestable; undeniable; as, an irrefragable argument; irrefragable evidence.

Example Sentences:

Refragable

Definition:

• (a.) Capable of being refuted; refutable.

Example Sentences: