villainous

villainous adjective abhorrent, abominable, accursed, arrant, atrocious, baleful, baneful, base, criminal, cursed, damnable, deceiving, delinquent, depraved, detestable, devilish, diabolic, disgraceful, dishonorable, dissipated, dissolute, evil, evildoing, evil-minded, execrable, facinorous, faithless, fell, felon, felonious, flagitious, foul, hateful, heinous, horrible, ignoble, ill-intentioned, immoral, incorrigible, infamous, iniquitous, knavish, lawless, loathsome, malefic, maleficent, malevolent, malicious, mean, menacing, monstrous, nefarious, nefast, notorious, obnoxious, odious, offensive, opprobrious, perfidious, pernicious, profligate, rancorous, rascally, repellent, reprehensible, reprobate, repugnant, repulsive, roguish, ruffianly, satanic, shameful, unregenerate, unscrupulous, venomous, vile, virulent, wicked

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See also: bad, contemptible, culpable, delinquent, felonious, heinous, inexpiable, iniquitous, malevolent, malignant, nefarious, notorious, obnoxious, offensive, outrageous, peccant, recreant, reprehensible, sinister, unscrupulous, vicious