Inexpiable

In*ex"pi*a*ble (?), a. [L. inexpiabilis: cf. F. inexpiable. See In- not, and Expiable.]

1. Admitting of no expiation, atonement, or satisfaction; as, an inexpiable crime or offense. Pomfret.

2. Incapable of being mollified or appeased; relentless; implacable. [Archaic] "Inexpiable hate." Milton.

They are at inexpiable war with all establishments.
Burke.