An enemy or a foe is an individual or a group that is seen as forcefully adverse or threatening. The concept of an enemy has been observed to be "basic for both individuals and communities". The term "enemy" serves the social function of designating a particular entity as a threat, thereby invoking an intense emotional response to that entity. The state of being or having an enemy is enmity, foehood or foeship.
The term enemy is derived from Latin for "bad friend" (Latin: inimicus). "Enemy" is a strong word, and "emotions associated with the enemy would include anger, hatred, frustration, envy, jealousy, fear, distrust, and possibly grudging respect". As a political concept, an enemy is likely to be met with hate, violence, battle and war. The opposite of an enemy is a friend or ally. Because the term "the enemy" is a bit bellicose and militaristic to use in polite society, informal substitutes are more often used. Often the substituted terms become pejoratives in the context that they are used. In any case, the designation of an "enemy" exists solely to denote the status of a particular group of people as a threat, and to propagate this designation within the local context. Substituted terms for an enemy often go further to meaningfully identify a known group as an enemy, and to pejoratively frame that identification. A government may seek to represent a person or group as a threat to the public good by designating that person or group to be a public enemy.
The characterization of an individual or/and group as an enemy is called demonization. The propagation of demonization is a major aspect of propaganda. An "enemy" may also be conceptual; used to describe impersonal phenomena such disease, and a host of other things. In theology, "the Enemy" is typically reserved to represent an evil deity,devil or a demon. For example, "in early Iroquois legend, the Sun and Moon, as god and goddess of Day and Night, had already acquired the characters of the great friend and enemy of man, the Good and Evil Deity". Conversely, some religions describe a monotheistic God as an enemy; for example, in 1 Samuel 28:16, the spirit of Samuel tells a disobedient Saul: "Wherefore then dost thou ask of me, seeing the LORD is departed from thee, and is become thine enemy?"