He must think us some band of strangers i’ the adversary’s entertainment.
I with a troop of Florentines will suddenly surprise him; such I will have whom I am sure he knows not from the enemy; we will bind and hoodwink him so that he shall suppose no other but that he is carried into the leaguer of the adversaries when we bring him to our own tents.
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.