Marked by strong resentment or cynicism:
— An acrimonious dispute.

synonym: bitter.

Roget 907: 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 etc. (discourteous) 895; surly, sullen etc. 901.1. cold, cold-blooded, cold-hearted; black-hearted, hard-hearted, flint-hearted, marble-hearted, stony-hearted; hard of heart, unnatural; ruthless etc. (unmerciful) 914.1; relentless etc. (revengeful) 919.    cruel; brutal, brutish; savage, savage as a bear, savage as a tiger; ferine^†, ferocious; inhuman; barbarous, barbaric, semibarbaric, fell, untamed, tameless, truculent, incendiary; bloodthirsty etc. (murderous) 361; atrocious; bloodyminded^†.    fiendish, fiendlike^†; demoniacal; diabolic, diabolical; devilish, infernal, hellish, Satanic; Tartaran.    ... show more

Roget 900: angry, wrath, irate; ireful, wrathful; cross etc. (irascible) 901; Achillean^†; sulky, etc. 901.1; bitter, virulent; acrimonious etc. (discourteous) etc. 895; violent etc. 173.    warm, burning; boiling, boiling over; fuming, raging; foaming, foaming at the mouth; convulsed with rage.    offended etc. v.; waxy, acharne; wrought, worked up; indignant, hurt, sore; set against.    fierce, wild, rageful^†, furious, mad with rage, fiery, infuriate, rabid, savage; relentless etc. 919.    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.    ... show more

Roget 895: discourteous, uncourteous^†; uncourtly^†; ill-bred, ill-mannered, ill-behaved, ill-conditioned; unbred; unmannerly, unmannered; impolite, unpolite^†; unpolished, uncivilized, ungenteel; ungentleman-like, ungentlemanly; unladylike; blackguard; vulgar etc. 851; dedecorous^†; foul-mouthed foul-spoken; abusive.    uncivil, ungracious, unceremonious; cool; pert, forward, obtrusive, impudent, rude, saucy, precocious.    repulsive; uncomplaisant^†, unaccommodating, unneighborly, ungallant; inaffable^†; ungentle, ungainly; rough, rugged, bluff, blunt, gruff; churlish, boorish, bearish; brutal, brusque; stern, harsh, austere; cavalier.    taint, sour, crabbed, sharp, short, trenchant, sarcastic, biting, doggish, caustic, virulent, bitter, acrimonious, venomous, contumelious; snarling etc. v.; surly, surly as a bear; perverse; grim, sullen etc. 901.1; peevish etc. (irascible) 901.    untactful, impolitic, undiplomatic; artless etc. 703; ... show more

Roget 392: pungent, strong; high-, full-flavored; high-tasted, high-seasoned; gamy, sharp, stinging, rough, piquant, racy; biting, mordant; spicy; seasoned etc. v.; hot, hot as pepper; peppery, vellicating^†, escharotic^†, meracious^†; acrid, acrimonious, bitter; rough etc. (sour) 397; unsavory etc. 395.    ... show more

Roget 395: unsavory, unpalatable, unsweetened, unsweet^†; ill-flavored; bitter, bitter as gall; acrid, acrimonious; rough.    offensive, repulsive, nasty; sickening etc. v.; nauseous; loathsome, fulsome; unpleasant etc. 830.    ... show more