viperous

Suggestive of or related to a viper.

Venomous; malicious.

Having the qualities of a viper; viperish; venomous; malignant; spiteful: chiefly said of mental qualities, or used figuratively.

Having the qualities of a viper; malignant; venomous.

of or pertaining to a viper

venomous, malicious or treacherous