irrefragable

adjective3

1. •
   Which cannot be refuted; clearly right, incontrovertible, indisputable, irrefutable.

   • He knew what's what, and that's as high / As Metaphysick Wit can fly, / In School Divinity as able / As he that hight Irrefragable; […] — 1662
2. •
   (no longer used) Which cannot or should not be broken; indestructible.

   • […] Intire Affection (from whence Integrity has its name) as it is answerable to it-self, proportionable, and rational; so it is irrefragable, solid, and durable. — 1699
3. •
   (no longer used) Of a person: obstinate, stubborn.

   • Many young men are as obstinate, and as curious in their choice, as tyrannically proud, insulting, deceitfull, false hearing, as irrefragable & peeuish, Narcissus like, […] — 1624