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1. Suggestive of or related to a viper.
2. Venomous; malicious.

vi′per·ous·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈvaɪpərəs) or


1. (Zoology) Also: viperine of, relating to, or resembling a viper
2. malicious
ˈviperously, ˈviperishly adv
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈvaɪ pər əs)

1. resembling a viper.
2. pertaining to or characteristic of vipers.
3. venomous.
vi′per•ous•ly, adv.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Those three defeats, along with the humiliation of a string of parliamentary defeats weakened her status as leader of the Conservative party -- a viperous pit of politicians self-consumed in petty prevarications and unable to put their nation's interests first.
It takes some doing to garner this comment from Henry Kissinger: "he's the most viperous character I know."
Research findings reported direct evidence of consumption of the head, scales, fangs and bones of a viperous snake.
Over the course of the weekend, the Jacobson siblings--in the presence of their mother, Roz, the victim of a terminal lung disease--rehearse their lifelong litany of grievances against their "mean, viperous, and unpredictable" father, Julian, a man with an uncanny knack for seeking out and exploiting each child's point of maximum emotional vulnerability.
This was remarkable for a relatively young man in the viperous and caste-conscious community of Kuching's expatriate officials.
Is suicide a response to systemic repressive regulated and controlled systems that are viperous and vicious?
Yet she also possesses the sort of ferocious screen magnetism that has long been evident in her years of solid supporting work, and it's a thrill to watch her finally sink her teeth into the showiest, most substantial role of her career: In any given scene, her Amy can seem vulnerable, aggrieved, calculating, heroic, overmatched, viperous and outright terrifying.
Civil dissension is a viperous worm That gnaws the bowels of the commonwealth.