gainsay

Deny or contradict a statement or fact

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

gainsay

to deny, dispute, or contradict.

there is no gainsaying his skill as a negotiator

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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.