Synonyms of 'gainsay'
to deny or contradictThere was no-one to gainsay this assertion.
Copyright © 2016 by HarperCollins Publishers. All rights reserved.
in the sense of contradict
to declare the opposite of (a statement) to be true
The result appears to contradict a major study carried out last December.
in the sense of controvert
Thesaurus for gainsay from the Collins English Thesaurus