American Heritage Dictionary
(1)
Century Dictionary
GNU Webster's 1913
WordNet
Elsewhere on the web
President Obama's relationship with the White House press corps is getting more adversarial, as illustrated by his White House news conference yesterday afternoon.— U.S. News
Any negotiation between creditors and debtors is adversarial, and creditors have spent many decades refining demagogic public relations ploys to divert attention to abstractions about "fairness."— GlobalResearch.ca
"We don't want to be adversarial, and, in fact, we want people to embrace the program, but we don't want them to be misinformed or uninformed."— News from www.rep-am.com
In the adversarial arena of attempting to obtain fair results for injured plaintiffs, establishing the legitimacy and severity of a client's injuries is always difficult.

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You can expect to see this word several times a year.