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Definition of antagonist:

  1. A medicine which opposes the action of another medicine or of a poison when absorbed into the blood or tissues.
  2. A muscle which acts in opposition to another; as a flexor, which bends a part, is the antagonist of an extensor, which extends it.
  3. Antagonistic; opposing; counteracting; as, antagonist schools of philosophy.
  4. One who contends with another, especially in combat; an adversary; an opponent.


thwarter, obstructionist, resist, opponent, oppositionist, opposer, obstructor, resister, adversary, obstructer, support.

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