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The Collaborative International Dictionary
Viperous

Viperous \Vi"per*ous\, a. Having the qualities of a viper; malignant; venomous; as, a viperous tongue. ``This viperous slander.''
--Shak. -- Vi"per*ous*ly, adv.

Wiktionary
viperous

a. 1 of or pertaining to a viper 2 venomous, malicious or treacherous

Usage examples of "viperous".

The escorts collected: Viperous with damage to her bridge-superstructure, the old corvette minus one of her boats, Compass Rose intact but rolling villainously, the trawler riding well, the tug tossing about with a ludicrous, almost hysterical violence as she tried to keep pace with the rest.