Definitions

1. verb

to express disagreement or opposition, especially in a negative or critical way

“The politician’s opponent began to naysay her proposals during the debate.”

2. noun

a person who expresses disagreement or opposition, especially in a negative or critical way

“The naysayers in the audience were vocal about their disapproval.”

3. verb (informal)

to deny or express doubt about the truth of something

“Many people choose to naysay the claims made in the conspiracy theory.”