gainsay

verb

Etymology: From Middle English gainsayen, ȝeinseggen (“to say against, say in opposition to”), equivalent to gain- + say. Compare Old Danish gensige (“to speak against; gainsay”), Swedish gensaga (“a speaking against; protest”).

1. To say something in contradiction to.

   “[…]vve are able with playne demonſtration to proue, and vvith reaſon to perſvvade that in tymes paſt our fayth vvas alike, that then vve preached thinges correſpondent vnto the forme of faith already publiſhed of vs, ſo that none in this behalfe can repyne or gayneſay vs.”

   “The supreme court, therefore, may assume jurisdiction over subjects and between parties, not allowed by the constitution, and there is no power in the federal government to gainsay it.”