merciless, remorseless, brutal, cunning, murderous, bloodthirsty, heartless, vengeful, sadistic, amoral, pitiless, rapacious, sociopathic, ferocious, savage, coldhearted, tenacious, wily, brutish, diabolical, imperious, venal, devious, canny, maniacal, thuggish, implacable, megalomaniac, avaricious, steely, fearsome, tyrannical, vicious, machiavellian, conscienceless, villainous, shrewd, cruel, fanatical, callous, skilful, resourceful, manipulative, arrogant, skillful, relentless, greedy, vindictive, pugnacious, streetwise, guileful, fearless, uncompromising, domineering, dastardly, resolute, loathsome, cowardly, unprincipled, monomaniacal, psychopathic, dictatorial, brazen, indomitable, unfeeling, egotistical, swashbuckling, cavalier, hardhearted, depraved, machinelike, spiteful, revengeful, buccaneering, methodical, sinister, shameless, inept, malevolent, despotic, doughty, wicked, despicable, cynical, mercenary, fiendish, duplicitous, hapless, flamboyant, cutthroat, opportunist, beastly, unrepentant, unforgiving, calculative, predatory, barbaric, unmerciful, spineless, notorious, unrelenting, crafty, inhuman, inhumane, aggressive, terroristic, barbarous, genocidal, ineffectual

bowelless, cutthroat, fierce, iron fist, ruthlessly, sendero luminoso, shark, shining path, sl, unsparing

merciless, pitiless, remorseless, unmerciful, unpitying