Definition of gainsayer in US English:

gainsayer

noun

formal
  • See gainsay

    • ‘The Pope's funeral illustrated just how important religion still is to us all, whatever the gainsayers would have you believe’
    • ‘Both schools attempt to defend the faith from the gainsayer, the naturalist, the rebel.’
    • ‘And with God as his ally, he can face the multitude of enemies and gainsayers who threaten him everywhere.’
    • ‘The phlegmatic attitude of continental Europeans to the euro puts British gainsayers to shame’
    • ‘In other words, these days a Luddite is (unfairly so) an automatic gainsayer against the march of technology.’