someone who is opposed to someone else and tries to do them harmHe must hide from his enemies while he is weak.
enemy of: They had been labelled enemies of the state.
make an enemy of someone: Worst of all is to make an enemy of the Minister.
make enemies: It’s easy to make enemies in a job like this.
a mortal enemy (=someone who will always be your enemy): She looked at her husband as if he were her mortal enemy.
a political enemy: They searched for information on political enemies.