Gainsay v. t. : To contradict; to deny; to controvert; to dispute; to forbid.

Example:
Christians: Even with His instructions before you (see link), you would still Gainsay Jesus?

Taxonomy
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Defination from the web:
gainsay from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "gainsay" and related topics at Britannica.com. Pronunciation Symbols. Share this entry: Link to this page: Cite this page: Products ...