naysayer
A person who advises potential victims against investing in pyramid schemes, Ponzi scams and similar types of fraud.
Word typically used by recruiters/pushers of such scams.
“Don’t listen to the naysayers who are spreading negativity; Join our fabulous Panama-based risk-free program, pay in 500 dollars, and receive a guaranteed 2% profit each day for 6 months!”
Gotto love urban dictionary. Under no circumstances look up a blumpkin or a chuck berry. You have been warned.
I shoulda listened.