What is having the qualities of a viper; malignant; venomous; as, a viperous tongue. "This viperous slander." Shak. -- Vi"per*ous*ly, adv called?

viperous — Having the qualities of a viper; malignant; venomous; as, a viperous tongue. "This viperous slander." Shak. -- Vi"per*ous*ly, adv. (Webster's 1913.)

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