viable: That idea won't work. Let me see whether I can come up with a viable alternative.
ADJ. practical or workable; capable of maintaining life.
vigor: Although he was over seventy years old, Jack had the vigor of a man in his prime. vigorous, ADJ.
N. active strength.
vilify: Waging a highly negative campaign, the candidate attempted to vilify his opponent's reputation. vilification, N.
vindicate: The lawyer's goal was to vindicate her client and prove him innocent on all charges. The critics' extremely favorable reviews vindicate my opinion that The Madness of King George is a brilliant movie.
v. clear from blame; exonerate; justify or support.
virtuoso: The promising young cellist Yo-Yo Ma grew into a virtuoso whose performances thrilled audiences throughout the world. virtuosity, N.
N. highly skilled artist.
virulent: Laid up with a virulent case of measles, Vera blamed her doctors because her recovery took so long. In fact, she became quite virulent on the subject of the quality of modern medical care.