evil

adj. wicked, bad, corrupt

n. wickedness, badness, malevolence

adv. in an evil manner, in a wicked manner, evilly

In ethics, evil refers to behavior which does harm, is dishonest, or fails to honor agreements. In some religions, notably the Christian and Zoroastrian religions, evil is an active force. In the Christian religion, good is, by definition, what God commands, and Satan works to spread evil (disobedience) in the world. Evil thoughts are as serious as evil actions. In Zoroastrianism there are two Gods, the good Ahura Mazda and the evil Ahriman. In most cultures, evil is used to describe acts or thoughts which are contrary to an established religion, or which could bring about suffering and death — the opposite of  good.
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Noun
1. morally objectionable behavior
(synonym) immorality, wickedness, iniquity
(hypernym) transgression, evildoing
(hyponym) deviltry, devilry
2. that which causes harm or destruction or misfortune; "the evil that men do lives after them; the good is oft interred with their bones"- Shakespeare
(hypernym) bad, badness
(hyponym) Four Horsemen
3. the quality of being morally wrong in principle or practice; "attempts to explain the origin of evil in the world"
(synonym) evilness
(antonym) good, goodness
(hypernym) immorality
(hyponym) malevolence, malevolency, malice
(attribute) wicked
Adjective
1. morally bad or wrong; "evil purposes"; "an evil influence"; "evil deeds"
(synonym) wicked
(antonym) good
(similar) atrocious, flagitious, grievous, heinous, monstrous
(see-also) bad
(attribute) evilness
2. having the nature of vice
(synonym) depraved, vicious
(similar) wicked
3. tending to cause great harm
(synonym) harmful, injurious
(similar) malign
4. having or exerting a malignant influence; "malevolent stars"; "a malefic force"
(synonym) malefic, malevolent, malign
(similar) maleficent

(n.)
Moral badness, or the deviation of a moral being from the principles of virtue imposed by conscience, or by the will of the Supreme Being, or by the principles of a lawful human authority; disposition to do wrong; moral offence; wickedness; depravity.
  

(n.)
malady or disease; especially in the phrase king's evil, the scrofula.
  

(n.)
Anything which impairs the happiness of a being or deprives a being of any good; anything which causes suffering of any kind to sentient beings; injury; mischief; harm; -- opposed to good.
  

(adv.)
In an evil manner; not well; ill; badly; unhappily; injuriously; unkindly.
  

(a.)
Producing or threatening sorrow, distress, injury, or calamity; unpropitious; calamitous; as, evil tidings; evil arrows; evil days.
  

(a.)
Having qualities tending to injury and mischief; having a nature or properties which tend to badness; mischievous; not good; worthless or deleterious; poor; as, an evil beast; and evil plant; an evil crop.
  

(a.)
Having or exhibiting bad moral qualities; morally corrupt; wicked; wrong; vicious; as, evil conduct, thoughts, heart, words, and the like.
  

Evil Good and evil are attributes of relativity in nature as cognized by the minds of percipient beings. "Esoteric philosophy admits neither good nor evil per se as existing independently in nature. The cause for both is found, as regards the Kosmos, in the necessity of contraries or contrasts, and with respect to man, in his human nature, his ignorance and passions. There is no devil or the utterly depraved, as there are no Angels absolutely perfect, though there may be spirits of Light and of Darkness . . ." (SD 2:162).
Pythagorean philosophy regards the duad as evil, and the One as the only good; which symbolizes that manifested qualities are in pairs of opposites, so that contrast subsists not merely within the pair itself but also between the pair considered as a whole and the One which is superior to it. Since throughout nature we find such pairs of opposites, reconciled by a synthesizing unity, it follows that the words good and evil of necessity are used in a relative sense, and convey the notion of incompleteness as contrasted with an intuitively conceived perfection. We cannot suppose that things can be good or evil in themselves, except relatively, or even in their relations to other things.