antagonist
[ænˈtæɡənɪst]
n.
敌手，反对者;
对抗肌，拮抗肌;
对抗药;
（戏剧，小说等的）反面人物;
例句:
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It is indecent to owe money to a political antagonist.
来自J. A. Froude
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Spassky had never previously lost to his antagonist.
斯帕斯基以往从未输给过他的对手。
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His antagonist in the debate was quicker than he.
在辩论中他的对手比他反应快.
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The thing is to know the nature of your antagonist.
要紧的是要了解你的对手的特性.
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The health-insurance industry went from being partner to antagonist.
来自WSJ
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Some have said that Nature is the antagonist of happiness.
来自E. Glasgow