Main entry: unforgiving
Definition: unwilling or unable to forgive or show mercy
Usage: a surly unforgiving old woman
Antonyms: forgiving
Definition: inclined or able to forgive and show mercy
Main entry: inexorable, grim, unrelenting, relentless, unappeasable, unforgiving, stern
Definition: not to be placated or appeased or moved by entreaty
Usage: grim determination; grim necessity; Russia's final hour, it seemed, approached with inexorable certainty; relentless persecution; the stern demands of parenthood
Antonyms: placable
Definition: easily calmed or pacified