noun
a person who refuses, denies, or opposes, esp. because of cynicism or pessimism. They went ahead with their ambitious plan despite the arguments of the naysayers.
transitive verb definition 1: to cause (another) to do something through reasoning, arguing, or appealing to the emotions. example:Their commercial really persuades people to try their product. example: Her professor persuaded her to publish her research paper.
definition 2: to cause (another) to believe something; convince. example:The lawyer persuaded the jury that her client was innocent. example:His sincere expression persuaded us that he was telling the truth.