Stinging; acerbic.
Having a sharp and stiff point.
Having a strong odor that stings the nose, said especially of acidic or spicy substances.
Having a strong taste that stings the tongue, said especially of hot (spicy) food, which has a strong and sharp or bitter taste.
Acerbic, bitter.
Sour; like vinegar.
Of a liquid, having turned partially or fully to vinegar.
Edward's maiden aunt was a vinegary old soul with a sharp tongue and quick temper; she would not be receiving a wedding invitation.