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HYPHEN
WORDNET DICTIONARY
OXFORD DICTIONARY
THESAURUS
ROGET THESAURUS

WORDNET DICTIONARY

Adjective unforgiving has 2 senses

• unforgiving(a = adj.all) Array - unwilling or unable to forgive or show mercy; "a surly unforgiving old woman"
Antonym: forgiving

• unforgiving(s = adj.all) grim, inexorable, relentless, stern, unappeasable, unrelenting - 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"

OXFORD DICTIONARY

THESAURUS

unforgiving

bowelless, cruel, dog-eat-dog, flinty, hard, harsh, heartless, inclement, inexorable, merciless, pitiless, relentless, remorseless, ruthless, uncompassionate, uncompassioned, unfeeling, unmerciful, unpitiful, unpitying, unremorseful, unsympathetic, unsympathizing, unyielding, without mercy

ROGET THESAURUS

unforgiving

Revenge

N revenge, revengement, vengeance, avengement, avengeance, sweet revenge, vendetta, death feud, blood for blood retaliation, day of reckoning, rancor, vindictiveness, implacability, malevolence, ruthlessness, avenger, vindicator, Nemesis, Eumenides, revengeful, vengeful, vindictive, rancorous, pitiless, ruthless, rigorous, avenging, unforgiving, unrelenting, inexorable, stony-hearted, implacable, relentless, remorseless, aeternum servans sub pectore vulnus, rankling, immitigable, manet ciratrix, manet alid mente repostum, dies irae dies illa, in high vengeance there is noble scorn, inhumanum verbum est ultio, malevolus animus abditos dentes habet, now infidel I have thee on the hip.

For further exploring for "unforgiving" in Webster Dictionary Online