noun
a person who opposes or fights against something
adjective
opposing or attacking
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The oppugnant arguments presented by the opposition were easily refuted by the expert debater.
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I can't believe how oppugnant my brother is being about the family vacation plans.
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Why are you being so oppugnant about trying the new restaurant? Just give it a chance!
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The darkness was oppugnant to the light, constantly trying to overpower it.