1. Sour or bitter in taste
   - acerbic, astringent 
2. Harsh or corrosive in tone
   - acerbic, acid, acrid, bitter, blistering, caustic, sulfurous [N. Amer], sulphurous [Brit, Cdn], virulent, vitriolic, sulphureous [Brit]

See also: sour, unpleasant

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