(Of the taste) of wine, cider, or some other alcoholic drink: sharp, acid, harsh, unrefined.

Of alcoholic drink: harsh or sharp to the taste; acidic; sour. Now chiefly of wine: having an astringent quality, typically due to a high tannin…

Lacking elements which are needful or desirable, and therefore capable of absorbing these to a great extent; ‘more disposed to draw from other…

In general use: sour, tart, sharp to the taste; tasting like vinegar.