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Adjective: viperine  'vI-pu,rIn
  1. Of, pertaining to, or resembling a viper
    "The snake's viperine head was triangular in shape";
    - viperous
     
  2. Malicious or spiteful
    "He gave a viperine look before storming out of the room";
    - viperous

Encyclopedia: Viperine