Synonyms of unforgiving

1 Syllable
cruel
2 Syllables
stony, ruthless, unkind, stonier, wreakful, hang-tough, heartless
3 Syllables
ruffianly, pitiless, merciless, relentless, vengeful, hard-shelled
4 Syllables
remorseless, implacable, unrelenting, iron-fisted, vindictive, unrepenting, ironfisted, revengeful
5 Syllables
unsympathetic, unsympathizing, uncharitable
6 Syllables
uncompassionate