a.
1.
( Rare .) Corrosive, caustic, sharp.
2.
Severe, harsh, hard, acrid, sarcastic, bitter, virulent, malignant, censorious, crabbed, snarling, snappish, testy, pettish, petulant, cross, sour, tart, splenetic, peevish, ill-tempered, ill-natured, rancorous, spiteful, envenomed, galling, grinding, biting, mordacious.