Related Clues:

• Enemy or competition
• Frenemy, in part
• Hatfield, to McCoy
• Unfriend?
• One who isn't with us
• Goliath, e.g
• End of a sentry's question
• Goliath, to David
• A personal enemy
• Persians, to the 300, e.g
• Sworn rival
• Evil rival
• He's full of enmity, principally
• Environmentalists' enemy
• Unfriendly opponent?