enemy

/ˈɛnəmi/
noun
  1. A person who hates or opposes another person and tries to harm them.
    • After the argument, they became enemies and never spoke again.
    • She considered her rival at work to be her enemy.
    • The soldier faced his enemy on the battlefield.
  2. A country or group that is fighting against another in a war.
    • They captured several enemy soldiers.
    • The army advanced deep into enemy territory.
    • The two countries were enemies during the war.
  3. Anything that is harmful or opposed to something else.
    • Lack of sleep is an enemy of good health.
    • Fear is the enemy of success.
    • Pollution is the enemy of clean air.
Antonyms