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Adjective: acidulous  u'si-ju-lus
  1. Being sour to the taste
    "They found a medium-sized red glossy fruit with a juicy and very acidulous pulp";
    - acidic, acid, acidulent
  2. Harsh or corrosive in tone
    - acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulfurous [N. Amer], sulphurous [Brit, Cdn], virulent, vitriolic, sulphureous [Brit]

See also: sour, unpleasant