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Adjective: vinegary  vi-ni-gu-ree
  1. Tasting or smelling like vinegar
    "The vinegary flavour of the dressing complemented the salad";
    - acetose, acetous, vinegarish
     
  2. Having a sour disposition; ill-tempered
    "Her vinegary remarks soured the mood of the meeting";
    - vinegarish

See also: ill-natured, sour