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countervailing
countervailing UK [ˌkaʊntə(r)ˈveɪlɪŋ] US [ˌkaʊntərˈveɪlɪŋ] adjective very formal
influencing something in an opposite but equally strong way

countervailing evidence

Thesaurus: opposite and in the opposite waysynonym

Useful english dictionary. 2012.