One of our adversaries having heard him preach a sermon that was much admired, thought he had somewhere read the sermon before, or at least a part of it.
I will not, by giving it up, lose my right of some time or other making reprisals on my adversaries.
There are no more uses of "adversary" in the book.
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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.