rancor

angry, wrath, irate; ireful, wrathful; cross (irascible); Achillean; sulky, [more]; bitter, virulent; acrimonious (discourteous); violent., warm, burning; boiling, boiling over; fuming, raging; foaming, foaming at the mouth; convulsed with rage., offended; waxy; wrought, worked up; indignant, hurt, sore; set against., fierce, wild, rageful, furious, mad with rage, fiery, infuriate, rabid, savage; relentless., flushed with anger, flushed with rage; in a huff, in a stew, in a fume, in a pucker, in a passion, in a rage, in a fury, in a taking, in a way; on one's high ropes, up in arms; in high dudgeon.

revengeful, vengeful; vindictive, rancorous; pitiless; ruthless, rigorous, avenging., unforgiving, unrelenting; inexorable, stony-hearted, implacable; relentless, remorseless., aeternum servans sub pectore vulnus; rankling; immitigable.

malevolent, unbenevolent; unbenign; ill-disposed, ill-intentioned, ill-natured, ill-conditioned, ill-contrived; evil-minded, evil-disposed; black-browed., malicious; malign, malignant; rancorous; despiteful, spiteful; mordacious, caustic, bitter, envenomed, acrimonious, virulent; unamiable, uncharitable; maleficent, venomous, grinding, galling., harsh, disobliging; unkind, unfriendly, ungracious; inofficious; invidious; uncandid; churlish (uncourteous); surly, sullen.