Truepenny is a noun that refers to an honest person.
Truepenny is a portmanteau word that combines ‘true’ and ‘penny’ to give us a word for something genuine. A true penny, of course, refers to a coin that is exactly as it appears.
I had my doubts about Erica’s agent when we first met. But after dealing with her for many years, I can see her for the true penny she is.