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Adjective: acerb  u'surb
  1. Sour or bitter in taste
    - acerbic, astringent
  2. Harsh or corrosive in tone
    "an acerb tone piercing otherwise flowery prose";
    - acerbic, acid, acrid, bitter, blistering, caustic, sulfurous [N. Amer], sulphurous [Brit, Cdn], virulent, vitriolic, acidulous, sulphureous [Brit]

See also: sour, unpleasant

Encyclopedia: Acerb