irrecusable

adjective

ir·​re·​cu·​sa·​ble ˌir-i-ˈkyü-zə-bəl 

: not subject to exception or rejection

irrecusable proof

irrecusably

ˌir-i-ˈkyü-zə-blē 

adverb

Word History

Etymology

Late Latin irrecusabilis, from Latin in- + recusare to reject, refuse — more at recusant

First Known Use

1776, in the meaning defined above