outright

But when Abel fell down upon the ground, seeing that his brother meant to kill him, he said to Cain, "O, my brother, have pity on me. By the breasts we have sucked, smite me not! By the womb that bare us and that brought us into the world, smite me not unto death with that staff! If thou wilt kill me, take one of these large stones, and kill me outright."