addicted to or characterized by vice; grossly immoral; depraved; profligate: a vicious life.
given or readily disposed to evil: a vicious criminal.
reprehensible; blameworthy; wrong: a vicious deception.
spiteful; malicious: vicious gossip; a vicious attack.
unpleasantly severe: a vicious headache.
characterized or marred by faults or defects; faulty; unsound: vicious reasoning.
savage; ferocious: They all feared his vicious temper.
(of an animal) having bad habits or a cruel or fierce disposition: a vicious bull.
Archaic. morbid, foul, or noxious.

1300–50; Middle English (< Anglo-French) < Latin vitiōsus, equivalent to viti(um) fault, vice1 + -ōsus -ous

viciously, adverb
viciousness, noun
unvicious, adjective
unviciously, adverb
unviciousness, noun

vicious, viscose, viscous.

1. abandoned, corrupt, iniquitous, sinful. 4. malevolent.

1. moral. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vicious (ˈvɪʃəs)
1.  wicked or cruel; villainous: a vicious thug
2.  characterized by violence or ferocity: a vicious blow
3.  informal unpleasantly severe; harsh: a vicious wind
4.  characterized by malice: vicious lies
5.  (esp of dogs, horses, etc) ferocious or hostile; dangerous
6.  characterized by or leading to vice
7.  invalidated by defects; unsound: a vicious inference
8.  obsolete noxious or morbid: a vicious exhalation
[C14: from Old French vicieus, from Latin vitiōsus full of faults, from vitium a defect]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 14c. (implied in viciously), "of the nature of vice, wicked," from Anglo-Fr. vicious, O.Fr. vicieus, from L. vitiosus "faulty, defective, corrupt," from vitium "fault" (see vice (1)). Meaning "inclined to be savage or dangerous" is first recorded 1711 (originally of animals,
especially horses); that of "full of spite, bitter, severe" is from 1825. In law, "marred by some inherent fault" (late 14c.), hence also this sense in logic (c.1600); cf. vicious circle in reasoning (c.1792), which was given a general sense of "a situation in which action and reaction intensify one another" by 1839.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
However, describing these unfortunate cases as an instance of eugenics is not
  only wrong, but actually vicious.
It's an exposé on the vicious pecking order that is sometimes humorous,
  sometimes mildly tragic.
Look, keep your vicious snotty snobberies and bravado if it comforts you.
Truth be told, that poster who was a bit vicious about calling pro-gun people
  liars was right about one thing.
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