acerb acerbate acerbic acid acidic acidulent acidulous acrimonious acute amaroidal antagonistic antipathetic asperous astringent austere belligerent biting bitter bitter as gall caustic clashing cloying coarse colliding conflicting corroding corrosive cutting despiteful double-edged edged escharotic featheredged fierce fine full of hate hard harsh hateful hostile incisive irritating keen keen-edged knifelike malevolent malicious malignant mordacious mordant nose-tickling oversweet penetrating piercing piquant poignant pungent quarrelsome rancorous razor-edged repugnant rigorous rough saccharine scathing scorching set set against severe sharp sore sour spiteful stabbing stinging strident stringent tart trenchant two-edged vehement venomous violent virulent vitriolic withering