affectless, anesthetized, arctic, autistic, blunt, callous, calloused, catatonic, chill, chilly, cold, cold as charity, cold of heart, coldblooded, coldhearted, cool, cryogenic, cryological, dispassionate, drugged, dull, emotionally dead, emotionless, flinthearted, frigid, frosted, frosty, frozen, hard, hard of heart, hardened, hardhearted, heartless, heterothermic, icy, immovable, impassible, impassive, inexcitable, insensitive, insusceptible, nonemotional, obdurate, objective, obtuse, out of touch, passionless, poikilothermic, self-absorbed, soulless, spiritless, stonyhearted, unaffectionate, unemotional, unfeeling, unimpassioned, unimpressionable, unloving, unmerciful, unnatural, unpassionate, unresponding, unresponsive, unsusceptible, unsympathetic, untouchable

apathetic, barbaric, barbarous, brutal, callous, cool, cruel, dispassionate, heartless, imperturbable, indifferent, inhuman, insensitive, merciless, pitiless, poikilothermic, ruthless, savage, steely, stony, thick-skinned, uncaring, unemotional, unexcited, unfeeling, unimpassioned, unmoved, unresponsive, unsympathetic, vicious