Fromviper +‎-ous.

viperous (comparativemoreviperous,superlativemostviperous)

1. of or pertaining to aviper

   Synonym:viperish

2. venomous,malicious ortreacherous

   Synonyms:reptilian,reptitious,viperish;see alsoThesaurus:evil,Thesaurus:treacherous

   • 1820,Charles Maturin,Melmoth the Wanderer:

     viperous as the suicide foam of captive Judas (iii)

   • 2007,Junot Díaz,The Brief Wondrous Life of Oscar Wao, Faber and Faber (2009), page230:

     Back home the portrait ofTrujillo, which every good citizen had hanging in his house, beamed down on him with insipid,viperous benevolence.

• viperously

• pervious,previous

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