Synonyms and related words :
acerbic, acrid, acute, antagonistic, antipathetic, baleful, baneful, belligerent, bitter, catching, caustic, clashing, colliding, communicable, conflicting, contagious, corroding, corrosive, corrupting, corruptive, counterproductive, cutting, damaging, dangerous, deadly, deleterious, despiteful, destructive, detrimental, disadvantageous, disserviceable, distressing, drastic, embittered, envenomed, excessive, exorbitant, extravagant, extreme, fierce, full of hate, furious, great, harmful, hateful, hostile, hurtful, immoderate, infectious, infective, injurious, intemperate, intense, keen, lethal, malefic, maleficent, malevolent, malicious, malign, malignant, mean, mephitic, miasmal, miasmatic, miasmic, mischievous, noisome, noxious, ominous, outrageous, pernicious, pestiferous, pestilential, piercing, poison, poisonous, prejudicial, quarrelsome, rancorous, repugnant, rigorous, rough, savage, scatheful, set against, severe, sharp, sore, spiteful, splenetic, splitting, tough, toxic, toxicant, toxiferous, unconscionable, vehement, venenate, veneniferous, venenous, vicious, violent, viperish, viperlike, viperous, virulent, vitriolic