Halfwit

Only a halfwit would say something like that.

It has been pointed out in this space before that a number of the titles you'll find shelved under self-help in your local bookshop are, on closer examination, farragos of wooden-headed tripe, written by mountebanks and halfwits.

“Doesn't matter. That man is not the leader.” “But he is the main guy on the show.” “He is an actor, Nandor. A simpleton who paints his face. He is an empty-headed puppet who thinks the world loves him, when in actual fact, he is nothing more than a lapdog begging for scraps.” [groans] “No, he is not the leader. That would be another devil who pulls the strings. The halfwit they call the director.”