Viperous, having the nature of a viper: “civil dissension is a v. worm that gnaws the bowels of the commonwealth,” H6A III, 1, 72 (cf. Viper in Per. I, 1, 64). == venomous, malignant: “this v. traitor,” Cor. III, 1, 287. “this v. slander,” Cymb. III, 4, 41.