persuasive

adj

1. Able to persuade; convincing.

   “But I'm pretty persuasive, and I've learned how elected officials think. I know how to press their buttons.”

noun

1. That which persuades; incitement.

   “He smiled a very knowing smile, and setting up a halloo, and shaking his leathern thong, away we went at the rate of seven or eight miles an hour. I had no occasion to go further with my persuasives; the pace was kept up, […]”