ir·re·cu·sa·ble 
(ĭr′ĭ-kyzə-bəl)
(ĭr′ĭ-kyzə-bəl)adj.
Not subject to challenge or objection: an irrecusable premise.
[French irrécusable, from Late Latin irrecūsābilis : Latin in-, not; see IN-1 + recūsābilis, deserving of rejection (from Latin recūsāre, to refuse; see RECUSE).]
ir′re·cusa·bly adv.