enemy
enemy (ĕnʹə-mē) noun
plural enemies
1. One who feels hatred toward, intends injury to, or opposes the interests of another; a foe.
2. a. A hostile power or force, such as a nation. b. A member or unit of such a force.
3. A group of foes or hostile forces. See Usage Note at collective noun.
4. Something destructive or injurious in its effects: "Art hath an enemy called Ignorance" (Ben Jonson).
adjective
Of, relating to, or being a hostile power or force.
[Middle English enemi, from Old French, from Latin inimīcus : in-, not. See in-1 + amīcus, friend.]
Synonyms: enemy, foe, opponent. The central meaning shared by these nouns is "one who is hostile to or opposes the purposes or interests of another": was betrayed by his enemies; a foe of fascism; a political opponent.