gainsay

• One was too solid to gainsay, the other too ghostlike, when they chose. —  Piers Anthony - [Xanth 29] - Pet Peeve (2005)
• It gave him liberties and rights which his enemies could not gainsay, and it laid on him obligations and duties which he never forgot. —  Luther and the Reformation: The Life-Springs of Our Liberties
• There were many other charges against the bishop which he could not gainsay, as they were all substantiated by good evidence All these things being made clear to his holiness, he was pleased to order, that the bishop should have no longer any authority in regard to the affairs of New Spain, of which the government should be conferred on Cortes, and that Velasquez should be remunerated for all the expences he had incurred on account of the expedition, which he could duly substantiate. —  A General History and Collection of Voyages and Travels — Volume 04 Arranged in Systematic Order: Forming a Complete History of the Origin and Progress of Navigation, Discovery, and Commerce, by Sea and Land, from the Earliest Ages to the Present Time
• I shall depend on you and Jameson to gather together a rather cosmopolitan crowd here to-night He said it with a quiet confidence which I could not gainsay, although I did not understand. —  The War Terror
• And though I hold all the philosophers in esteem, and am unwilling to incur odium by my censure, I can adduce a proof of my assertion, which I do not think any of them will gainsay, which is, that they all laid down as a principle what they did not perfectly know. —  The Selections from the Principles of Philosophy

Roget's II: The New Thesaurus

Allen's Synonyms and Antonyms