"Nincompoop" is a word used to describe someone who is silly, foolish, or incompetent. It is often used in a light-hearted or joking manner to playfully tease someone for their lack of intelligence or common sense. Full definition
I feel that I'm in the presence of a blithering nincompoop who is stupid enough to believe that insane blather. (religion.blogs.cnn.com)
My reply was that the laboratory workers had sabotaged themselves by assuming they could con a bunch of nincompoop dog owners into offering up their dogs» jugular veins to con artists. (thedogplace.org)
And I see the venting of one who is fed up with nincompoops - if you hear «screeching», so be it. (religion.blogs.cnn.com)