What is a 19th Century slang word for a stupid person?

Oh, dude, back in the 1800s, they used to call someone a "nincompoop" if they were acting like a total airhead. It's like the OG way of saying "dummy" or "dunce." So, if you ever want to throw it back to the good ol' days, just drop a "nincompoop" on someone and watch their confusion unfold.