inexpiable
adjectiveImpossible to expiate or atone for.
adjectiveImplacable.
Not to be expiated; admitting of no expiation or atonement: as, an inexpiable crime or offense.
Not to be satisfied or appeased by expiation; implacable.
adjectiveAdmitting of no expiation, atonement, or satisfaction.
adjectiveIncapable of being mollified or appeased; relentless; implacable.
adjectiveboth
incapable of being atoned for