Synonyms of inhuman

1 Syllable
mean, cruel, fell, grim
2 Syllables
crueler, ruthless, cruelest, brutal, wolfish, monstrous, fierce, unkind, vicious, bestial, lowbrow, hellborn, hang-tough, ogreish, beastly, fiendish, heartless, malign
3 Syllables
ferocious, barbarians, pitiless, outrageous, uncordial, hardhearted, barbarian, truculent, malicious, tigerish, barbaric, teratoid, merciless, savage, malignant, devilish, barbarous, ferine, miscreated, relentless, cold-blooded, bloodthirsty, hateful, unfeeling
4 Syllables
ironhearted, diabolical, unspeakable, oppressive, remorseless, implacable, stony-hearted, unamiable, unrelenting, demonical, impersonal, depressive, stonyhearted, satanical, unrepenting, inhumane
5 Syllables
cannibalistic, unsympathetic, undescribable, superincumbent, mephistophelian, unutterable, inexpressible, indefinable
6 Syllables
uncompassionate, incommunicable