Here were the servants of your adversary And yours, close fighting ere I did approach: I drew to part them: in the instant came The fiery Tybalt, with his sword prepar’d; Which, as he breath’d defiance to my ears, He swung about his head, and cut the winds, Who, nothing hurt withal, hiss’d him in scorn: While we were interchanging thrusts and blows, Came more and more, and fought on part and part, Till the prince came, who parted either part.
There are no more uses of "adversary" in the play.
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Then, again, our military training is in many respects superior to that of our adversaries.
Thucydides -- Pericles’s Funeral Oration
Finally, it was rumored, there would be complete information-sharing among all of these previously disconnected and even adversarial entities, and when they were coordinated, and once all the health data they’d collected was shared, most of this made possible through the Circle and more important, TruYou, viruses could be stopped at their sources, diseases would be tracked to their roots.