Synonyms of uncompassionate

1 Syllable
mean, hard, tough, cool, cruel, harsh, cold
2 Syllables
stony, frigid, unkind, icy, stonier, feller, bullhead, nasty, callous, aloof, heartless
3 Syllables
inhuman, lukewarm, hard-hearted, hardened, unmoved, stiff-necked, unstirred, uncordial, hardhearted, untouched, repugnant, uncaring, unpitying, coldblooded, unpleasant, phlegmatic, halfhearted, cold-blooded, repellent, unfeeling
4 Syllables
ironhearted, unforgiving, remorseless, uncongenial, stony-hearted, obdurate, unamiable, aversive, indifferent, apathetic, compassionless, unconcerned, stonyhearted, case-hardened, inhumane, unrepenting
5 Syllables
disinterested, unemotional, unresponsive, unsympathetic, insensitive, unsympathizing, casehardened, antipathetic, unexcitable, uncharitable