Synonyms and related words :
acid, acidulous, acrid, acrimonious, acute, astringent, biting, bitter, caustic, cutting, edged, escharotic, featheredged, fierce, fine, harsh, incisive, keen, keen-edged, knifelike, mordacious, mordant, penetrating, piercing, poignant, razor-edged, rigorous, rough, scathing, set, severe, sharp, stabbing, stinging, strident, stringent, tart, trenchant, two-edged, vehement, violent, virulent, vitriolic