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Adjective: vitriolic  ,vi-tree'ó-lik
  1. Harsh or corrosive in tone
    "a vitriolic critique";
    - acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulfurous [N. Amer], sulphurous [Brit, Cdn], virulent, acidulous, sulphureous [Brit]
  2. Of a substance, especially a strong acid; capable of destroying or eating away by chemical action
    - caustic, corrosive, erosive, mordant

See also: destructive, unpleasant

Encyclopedia: Vitriolic