merciful

merciless, savage, unrelenting, pitiless, relentless, ferocious, brutal, unforgiving, vicious, remorseless, incessant, hellacious, cruel, monstrous, beastly, unremitting, implacable, wrathful, brutish, untempered, unceasing, unfeeling, insensate, heartless, rageful, unthankful, withering, torturous, fearsome, callous, wicked, bloodthirsty, ungodly, hellish, damnable, unyielding, ceaseless, ruthless, unbearable, defenseless, inhuman, maniacal, impenitent, spiteful, exacting, diabolical, unreasoning, sanctimonious, bestial, insufferable, righteous, lacerating, wanton, abominable, wretched, loathsome, recriminatory, abject, vile, dunderheaded, artless, contemptible, coldhearted, unheeding, excruciating, sadistic, opprobrious, unspeakable, brusk, unwonted, captious, unendurable, scabrous, unseeing, animalistic, untamable, cultureless, vituperative, intemperate, mindless, adamantine, vindictive, desolating, numbing, unending, depraved, imbecilic, vengeful, grotesque, somnambulistic, stinging, abasement, pharisaical, obstinate, unhuman, rebarbative, unsparing, condign, meek, insensible, pestilential, speciesist, revengeful, unpitying, unkind, rapacious, ungenerous, capricious, unkindly, forbearing

bowelless, cutthroat, fierce, mortal, tigerish