unpardonable

adj

1. impossible to pardon; impossible to excuse or justify

   “And you will ſee it really may happen in this very happy land, that men who are rich may commit, with impunity, crimes infinitely more unpardonable, becauſe they are committed with leſs temptation, than thoſe for which “little villains” ſuffer every day—crimes which involve in their conſequences the moſt fatal events.”

   “"I can understand your being wicked," she said keenly, "but not your being cowardly. That is and was unpardonable."”

   “To lose a game was bad enough, but to round on a comrade was unpardonable; while to lose from the game a half-back of Cameron's calibre was unthinkable.”

   “It would be unpardonable to ignore the repeated lessons of history.”

   “Furthermore, what would otherwise be good points about the sort of selective literalism that renders homosexuality an unpardonable sin but shrugs off Sarah Palin’s biblically forbidden pearl earrings are lost in Eichenwald’s assumption that evangelicals make these decisions “with less care than they exercise in selecting side orders for lunch.””