acrimonious synonyms:
adj
abusive, acerbic, angry, bad-tempered, bitter, caustic, censorious, churlish, cutting, hostile, hot-tempered, ill-natured, ill-tempered, irascible, mordant, peevish, petulant, quarrelsome, rancorous, sarcastic, sharp, spiteful, tart, testy, venomous, virulent, waspish.
Opp PEACEABLE.