gainsay 

Deny or contradict a statement or fact

None could gainsay him though the results of his tests were conclusive.

gainsay by talk2me-JCH2 June 11, 2023

gainsay 

to deny, dispute, or contradict.

there is no gainsaying his skill as a negotiator

gainsay by reazbuet99 June 21, 2009

Gainsay 

To deny; to declare false

The defense tried every trick to gainsay the evidence, but in the end, three witnesses, DNA evidence and a video were overwhelming and could not be contradicted.

Gainsay by LaPioche November 22, 2021

Gainsy 

an adjective used to describe someone who has made serious gains.

"Dang have you seen Tom lately, he is looking gainsy"

"Im feeling super gainsay after that gym sesh"

Gainsy by Scrotey mcboogerballs October 24, 2014