hard
A young wine that’s excessively tannic (with reds), or acidic (typically with whites), or both. Such wines often mellow and soften (see soft) with aging.
The New Wine Lovers Companion, 2nd Edition, by Ron Herbst and Sharon Tyler Herbst. Copyright © (1) 2003, 1995 by Ron Herbst and Sharon Tyler Herbst. Reprinted by arrangement with Barron's Educational Series, Inc.