gainsay [geɪnˈseɪ] (past and past participle -said )
[with obj.][with negative](formal)deny or contradict (a fact or statement) (正式)否认;反驳(事件,陈述) the impact of the railways cannot be gainsaid. 铁路的作用无法否认。 ■speak against or oppose (someone) 反驳;反对(某人)
派生 gainsayer noun 语源
Middle English: from obsolete gain- 'against' + say