gainsayEnglishOxford Dictionary of Englishgainsay /ˌɡeɪnˈseɪ / ▸ verb (past and past participle gainsaid /ɡeɪnˈsed/) [with object and negative] formal deny or contradict (a fact or statement): the impact of the railways cannot be gainsaid. ▪ speak against or oppose (someone): none could gainsay her. – DERIVATIVES gainsayer noun– ORIGIN Middle English: from obsolete gain- ‘against’ + say.