Vinegary

Adjective

1. Sour; like vinegar.

   "When Martha reopened the bottle of wine from the previous week's party, a vinegary whiff indicated that drinking it was out of the question."

2. Acerbic, bitter, irritable.

   "Edward's maiden aunt was a vinegary old soul with a sharp tongue and quick temper; she would not be receiving a wedding invitation."

3. Of a liquid, having turned partially or fully to vinegar.