Viperous

Vi'perĀ·ous adjective Having the qualities of a viper; malignant; venomous; as, a viperous tongue. 'This viperous slander.' Shak. -- Vi'per*ous*ly , adverb
Found on http://www.encyclo.co.uk/webster/V/27

Viperous

• (a.) Having the qualities of a viper; malignant; venomous; as, a viperous tongue.
Found on http://thinkexist.com/dictionary/meaning/viperous/

viperous

viperous Having the qualities of a viper; malignant; venomous or malicious; such as, a viperous tongue.
Found on http://www.wordinfo.info/words/index/info/view_unit/2318/4

viperous

of, like, or pertaining to vipers; treacherous; venomous
Found on http://phrontistery.info/v.html
No exact match found