In saying this he drew a long poniard which he always carried about him; and not imagining that his adversary had any arms he threw himself upon Candide: but our honest Westphalian had received a handsome sword from the old woman along with the suit of clothes.
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.