Gainsay

[Sarah]

To contradict; to deny; to controvert; to dispute; to forbid.I will give you a mouth and wisdom which all your adversaries shallnot be able to gainsay nor resist. Luke xxi. 15.The just gods gainsay That any drop thou borrow'dst from thy mother,My sacred aunt, should by my mortal sword Be drained. Shak.

[Sarah]

to deny, dispute, or contradict.

[Sommer]

to refuse to accept something as the truth:

[Jason Yan]

Deny or contradict (a fact or statement)