Briary -
Denotes a wine having an aggressive, prickly taste best described as peppery. Sometimes combined with the adjective brawny to characterize a young red wine with high alcohol and tannin content. - http://www.gifttree.com/gifts/wine/wine_terms_taste.php

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Brawny: Brawny wines are young red wines with harsh tannins and high alcohol content, also referred to as briary and backward. Brawny wines are aged to help soften the tannins and mellow the alcohol content, resulting in a more elegant, well rounded wine.

Briary: Briary is a term used to describe wines that are strong in alcohol content and high in tannins. Briary is often used in the same manner as brawny.

http://wine.lovetoknow.com/wine-beginners/wine-characteristi...

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backward:

An adjective used to describe (1) a young largely unevolved, closed, and undrinkable wine, (2) a wine that is not ready to drink, or (3) a wine that simply refuses to release its charms and personality.

https://www.erobertparker.com/info/glossary.asp

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Note added at 5 hrs (2013-06-30 01:25:38 GMT)
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BACKWARD: Used to describe a young wine that is less developed than others of its type and class from the same vintage. - http://www.cawineclub.com/Wine-Tasting-Terms

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A tasting term. Wines described as backward are undeveloped and not ready to drink. They are often young and tannic, and may also be described as austere. - http://en.mimi.hu/wine/backward.html