Synonyms of cruel

1 Syllable
hard, lou, harsh, stern, grim
2 Syllables
stony, deadliest, monstrous, wreakful, ferrous, fiendish, bitter, brutish, spleenful, fiercest, sinful, poignant, irons, brutal, evil, fierce, lowbrow, bestial, fiercer, cutthroat, ferric, woeful, soulless, deadlier, ruthless, painful, flinty, violent, sterner, stonier, steeler, wicked, deadly, hellish, hardshell, scathing, ghoulish, sickie, unfair, grimmer, unkind, vicious, feller, iron, grimmest, ogreish, callous, sternest, beastly, heartless
3 Syllables
hard-hearted, pitiless, unstirred, barbarian, barbaric, teratoid, spiteful, unpitying, atrocious, rancorous, relentless, satanic, unthankful, horrific, villainous, unsporting, severest, demoniac, horrible, subhuman, sadistic, coldblooded, severer, virulent, draconian, pernicious, sanguineous, barbarians, depraved, uncordial, murderous, merciless, vengeful, cold-blooded, bloodthirsty, hateful, miscreated, hard-shelled, unfeeling, ferocious, ruffianly, inhuman, diabolic, slaughterous, hardened, tigerish, barbarous
4 Syllables
excruciating, implacable, unrelenting, aversive, iron-fisted, unnatural, ironhearted, tyrannical, oppressive, remorseless, demonical, depressive, inhumane, unamiable, iron-handed, heavy-handed, vindictive, satanical, unrepenting, ironfisted, revengeful, unforgiving, diabolical, malevolent
5 Syllables
inexorable, unsympathetic, superincumbent, unappreciated, degenerate
6 Syllables
uncompassionate, unappreciative, inappreciative