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

See also: sour, unpleasant