INEXPIABLE
Source: 566, 567
inexpiable. Inexpiable, a. that cannot be atoned for, horrid
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In‐ex″pi‐a‐ble (?), a. [[L. inexpiabilis: cf. F. inexpiable. See In- not, and Expiable.]] 1. 1. Admitting of no expiation, atonement, or satisfaction; as, an inexpiable crime or offense. Pomfret.
2. 2. Incapable of being mollified or appeased; relentless; implacable. “Inexpiable hate.” Milton.
They are at inexpiable war with all establishments. Burke.