Synonyms and related words :
acerb, acerbate, acerbic, acid, acidic, acidulent, acidulous, acrid, acrimonious, astringent, biting, bitter, brutal, burning, caustic, corroding, corrosive, cutting, damaging, double-edged, edged, escharotic, ferocious, fierce, harmful, harsh, incisive, keen, mordacious, mordant, nasty, penetrating, piercing, poignant, rigorous, rough, salty, savage, scorching, searing, severe, sharp, stabbing, stern, stinging, strident, stringent, tart, trenchant, vehement, violent, virulent, vitriolic, withering