The Collaborative International Dictionary
Inexpiable
Inexpiable \In*ex"pi*a*ble\, a. [L. inexpiabilis: cf. F. inexpiable. See In- not, and Expiable.]
Admitting of no expiation, atonement, or satisfaction; as, an inexpiable crime or offense.
--Pomfret.-
Incapable of being mollified or appeased; relentless; implacable. [Archaic] ``Inexpiable hate.''
--Milton.They are at inexpiable war with all establishments.
--Burke.
Douglas Harper's Etymology Dictionary
Wiktionary
inexpiable
a. both unforgivable and inexplicable
WordNet
inexpiable
adj. incapable of being atoned for
Usage examples of "inexpiable".
Among these we may distinguish the inexpiable guilt of calumniating a bishop, a presbyter, or even a deacon.