Webster’s Revised Unabridged Dictionary · 1913
Viperous
Vi′per·ous (·ŭs), a. Having the qualities of a viper; malignant; venomous; as, a viperous tongue. "This viperous slander." Shak. — Vi′per·ous·ly, adv.
Webster’s Revised Unabridged Dictionary · 1913
Vi′per·ous (·ŭs), a. Having the qualities of a viper; malignant; venomous; as, a viperous tongue. "This viperous slander." Shak. — Vi′per·ous·ly, adv.