morally wrong or bad; immoral; wicked: evil deeds; an evil life.
harmful; injurious: evil laws.
characterized or accompanied by misfortune or suffering; unfortunate; disastrous: to be fallen on evil days.
due to actual or imputed bad conduct or character: an evil reputation.
marked by anger, irritability, irascibility, etc.: He is known for his evil disposition.
that which is evil; evil quality, intention, or conduct: to choose the lesser of two evils.
the force in nature that governs and gives rise to wickedness and sin.
the wicked or immoral part of someone or something: The evil in his nature has destroyed the good.
harm; mischief; misfortune: to wish one evil.
anything causing injury or harm: Tobacco is considered by some to be an evil.
a harmful aspect, effect, or consequence: the evils of alcohol.
a disease, as king's evil.
in an evil manner; badly; ill: It went evil with him.
the evil one, the devil; Satan.

before 900; Middle English evel, evil, Old English yfel; cognate with Gothic ubils, Old High German ubil, German übel, Old Frisian, Middle Dutch evel

evilly, adverb
evilness, noun
nonevil, adjective
nonevilly, adverb
nonevilness, noun
quasi-evil, adjective
quasi-evilly, adverb
unevil, adjective
unevilly, adverb

1. sinful, iniquitous, depraved, vicious, corrupt, base, vile, nefarious. See bad1. 2. pernicious, destructive. 6. wickedness, depravity, iniquity, unrighteousness, corruption, baseness. 9. disaster, calamity, woe, misery, suffering, sorrow.

1. righteous.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
evil (ˈiːvəl)
1.  morally wrong or bad; wicked: an evil ruler
2.  causing harm or injury; harmful: an evil plan
3.  marked or accompanied by misfortune; unlucky: an evil fate
4.  (of temper, disposition, etc) characterized by anger or spite
5.  not in high esteem; infamous: an evil reputation
6.  offensive or unpleasant: an evil smell
7.  slang good; excellent
8.  the quality or an instance of being morally wrong; wickedness: the evils of war
9.  (sometimes capital) a force or power that brings about wickedness or harm: evil is strong in the world
10.  archaic an illness or disease, esp scrofula (the king's evil)
11.  (now usually in combination) in an evil manner; badly: evil-smelling
[Old English yfel, of Germanic origin; compare Old Frisian evel, Old High German ubil evil, Old Irish adbal excessive]

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

O.E. yfel (Kentish evel) "bad, vicious," from P.Gmc. *ubilaz (cf. O.Saxon ubil, Goth. ubils), from PIE *upelo-, giving the word an original sense of "uppity, overreaching bounds" which slowly worsened. "In OE., as in all the other early Teut. langs., exc. Scandinavian, this word is the most comprehensive
adjectival expression of disapproval, dislike or disparagement" [OED]. Evil was the word the Anglo-Saxons used where we would use bad, cruel, unskillful, defective (adj.), or harm, crime, misfortune, disease. The meaning "extreme moral wickedness" was in O.E., but did not become the main sense until 18c. Related: Evilly. Evil eye (L. oculus malus) was O.E. eage yfel.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

evil definition

As used by a hacker, implies that some system, program, person, or institution is sufficiently maldesigned as to be not worth the bother of dealing with. Unlike the adjectives in the cretinous, losing, brain-damaged series, "evil" does not imply incompetence or bad design, but rather a set of goals or design criteria fatally incompatible with the speaker's. This usage is more an aesthetic and engineering judgment than a moral one in the mainstream sense. "We thought about adding a Blue Glue interface but decided it was too evil to deal with." "TECO is neat, but it can be pretty evil if you're prone to typos." Often pronounced with the first syllable lengthened, as /eeee'vil/.
Compare evil and rude.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences for evil
Every mortal must learn that there is neither power nor reality in evil.
It is society that interferes with tom, and not personified evil.
Peck came to the conclusion that possession was a rare phenomenon related to
He strongly affirmed that men had free will and were able to choose good as
  well as evil.
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