Synonyms of unrepenting

1 Syllable
hard, tough, cruel, sour, harsh, grim
2 Syllables
bloody, greedy, ruthless, fierce, callous
3 Syllables
forbidding, inhuman, unyielding, hard-hearted, hardened, pitiless, rigorous, murderous, merciless, savage, barbarous, relentless, shameless, hard-bitten
4 Syllables
avaricious, unforgiving, tyrannical, remorseless, implacable, obdurate, unrelenting, unremitting, intolerant, unmerciful, sanguinary, uncontrite, impenitent, vindictive, inhumane
5 Syllables
inexorable, insensitive
6 Syllables
uncompassionate, unregenerate