adversarial ˌad-vər-ˈser-ē-əl , ˌad-və-, adjective
: characterized by antagonism or negative feelings between opposing people or sides
The word adversarial has appeared in 89 articles on NYTimes.com in the past year, including on Oct. 12 in “How a Feud Between Cuomo and de Blasio Led to a Chaotic Virus Crackdown” by Jesse McKinley, Luis Ferré-Sadurní, Dana Rubinstein and Joseph Goldstein:
The governor and mayor, both Democrats, have feuded for years, and their reluctance to work together closely has become a critical issue during the pandemic. Mr. de Blasio, who needed Mr. Cuomo’s approval to act, pushed out a plan without the state’s blessing, only to have the governor override that plan with one of his own — causing unnecessary confusion for thousands of business owners and school parents.
… As Mr. Cuomo’s staff worked to finish their own plan, Mr. Cuomo tried his hand at diplomacy, gathering Orthodox leaders on a conference call Tuesday morning.
The governor asserted that local officials like Mr. de Blasio wanted a “total close-down” of synagogues, while he wanted to work with the Orthodox community to cap the occupancy at 50 percent.
“I don’t want to do it in an adversarial way,” the governor said, according to a recording of the conversation obtained by The New York Times. “I need you to tell the community, ‘We have to comply.’”