Synonyms of heartless

1 Syllable

hard, cruel, harsh

2 Syllables

soulless, crueler, stony, ruthless, cruelest, brutal, unkind, stonier, feller, wicked, bullhead, callous, stoical

3 Syllables

unsocial, inhuman, hard-hearted, hardened, pitiless, feelingless, stiff-necked, thick-skinned, unstirred, coldhearted, uncordial, hardhearted, hardboiled, cold-hearted, uncaring, unpitying, merciless, subhuman, savage, coldblooded, ferine, barbarous, cold-blooded, hard-boiled, unfeeling

4 Syllables

ironhearted, unforgiving, unaroused, unimpressed, stony-hearted, obdurate, unamiable, impassive, aversive, indifferent, unmerciful, compassionless, stonyhearted, emotionless, case-hardened, inhumane

5 Syllables

unemotional, insusceptible, unsympathetic, insensitive, casehardened, inexcitable, nonemotional

6 Syllables

uncompassionate