viperous


From The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]
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