adversativeyoudaoicibaDictYouDict
"(Of a word or phrase) expressing opposition or antithesis", Late Middle English: from French adversatif, -ive or late Latin adversativus, from Latin adversari 'oppose', from adversus (see adverse).
adversativelyyoudaoicibaDictYouDict
"In an adversative manner; so as to express opposition", Late 16th cent.; earliest use found in Arthur Golding (d. 1606), translator. From adversative + -ly, after post-classical Latin adversative.