Definition of antagonist (n)

 

Bing Dictionary

an·tag·o·nist

[ an tággənist ]

1. opponent: somebody or something opposing or in conflict with another
2. character in conflict with hero: a major character in a book, play, or movie whose values or behavior are in conflict with those of the protagonist or hero
3. neutralizing agent: a drug that neutralizes the effect of a substance on the body

Synonyms: rival, adversary, opponent, enemy, contender, competitor