unforgiving -
unwilling or unable to forgive or show mercy; "a surly unforgiving old woman"
forgiving inclined or able to forgive and show mercy; "a kindly forgiving nature"; "a forgiving embrace to the naughty child"
unforgiving -
not to be placated or appeased or moved by entreaty; "grim determination"; "grim necessity"; "Russia's final hour, it seemed, approached with inexorable certainty"; "relentless persecution"; "the stern demands of parenthood"
