Then, brother John of Lancaster, to you This honourable bounty shall belong: Go to the Douglas, and deliver him Up to his pleasure, ransomless and free: His valour, shown upon our crests to-day, Hath taught us how to cherish such high deeds Even in the bosom of our adversaries.
So, when he had occasion to be seen, He was but as the cuckoo is in June, Heard, not regarded; seen, but with such eyes As, sick and blunted with community, Afford no extraordinary gaze, Such as is bent on sun-like majesty When it shines seldom in admiring eyes; But rather drowsed, and hung their eyelids down, Slept in his face, and render’d such aspect As cloudy men use to their adversaries, Being with his presence glutted, gorged, and full.
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.