indefeasible adjective. 
[ɪndɪ'fi:zɪb(ǝ)l] M16.[from IN-3 + DEFEASIBLE.](Esp. of a claim, right, etc.) not liable to be made void; unable to be forfeited or annulled.
 ■   indefeasi'bility noun E19. ■   indefeasibleness noun (
rare) 
M18. ■   indefeasibly adverb M16.  [TahlilGaran] English Dictionary ▲