General Antonyms:
* Enemy: Someone who is actively hostile or opposed to you.
* Foe: Similar to "enemy," but often implies a more personal or longstanding conflict.
* Adversary: Someone who is a competitor or opponent in a contest or struggle.
* Opponent: Someone who is against you in a debate, competition, or other situation.
* Rival: Someone who is competing with you for the same thing (e.g., a job, a prize, or a romantic partner).
Less Direct Antonyms:
* Stranger: Someone you don't know.
* Acquaintance: Someone you know casually, but not well enough to consider a friend.
* Neutral party: Someone who is not aligned with either side of a conflict.
* Alienated: Someone who feels isolated and alone.
Words Related to Disharmony:
* Betrayer: Someone who breaks your trust.
* Traitor: Someone who betrays their country or group.
* Backstabber: Someone who is secretly working against you.
* Deceiver: Someone who intentionally leads you astray.
The best word to use will depend on the specific situation and the kind of relationship you're describing.