Irre*mis"si*ble

from The Collaborative International Dictionary of English v.0.48

Irremissible \Ir`re*mis"si*ble\, a. [L. irremissibilis: cf. F.
   irr['e]missible. See {In-} not, and {Remissible}.]
   Not remissible; unpardonable; as, irremissible crimes.
   --Burke. -- {Ir`re*mis"si*ble}, n. -- {Ir`re*mis"si*bly},
   adv.
   [1913 Webster]