Expiable :: Expiable (a.) Capable of being expiated or atoned for; as, an expiable offense; expiable guilt..
Inexpiable :: Inexpiable (a.) Admitting of no expiation, atonement, or satisfaction; as, an inexpiable crime or offense..
Inexpiable :: Inexpiable (a.) Incapable of being mollified or appeased; relentless; implacable.
Inexpiably :: Inexpiably (adv.) In an inexpiable manner of degree; to a degree that admits of no atonement.