Vigorous :: Vigorous (a.) Possessing vigor; full of physical or mental strength or active force; strong; lusty; robust; as, a vigorous youth; a vigorous plant..
Vigorous :: Vigorous (a.) Exhibiting strength, either of body or mind; powerful; strong; forcible; energetic; as, vigorous exertions; a vigorous prosecution of a war..
Viperous :: Viperous (a.) Having the qualities of a viper; malignant; venomous; as, a viperous tongue..
Viviparous :: Viviparous (a.) Producing young in a living state, as most mammals, or as those plants the offspring of which are produced alive, either by bulbs instead of seeds, or by the seeds themselves germinating on the plant, instead of falling, as they usually do; -- opposed to oviparous..