A group of foes or hostile forces. See Usage Note at collective noun. Something destructive or injurious in its effects: “Art hath an enemy called Ignorance” (Ben Jonson).
Middle English enemi, from Old French, from Latin inimcus : in-, not; see in-1 + amcus, friend.] Synonyms: enemy, foe, opponent These nouns denote one who is hostile to or opposes the purposes or interests of another: betrayed by enemies; a foe of fascism; a political opponent.