Definition of antagonist noun from the Oxford Advanced American Dictionary

     

    antagonist

     noun
    noun
    NAmE//ænˈtæɡənɪst//
     
    (formal)
     
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  1. 1a person who strongly opposes someone or something synonym opponent
  2. 2 He has always been the prime minister's most formidable antagonist in Parliament.
See the Oxford Advanced Learner's Dictionary entry: antagonist