the idea : the person
simple : a simpleton dimwitted : a dimwit
imbecilic : an imbecile moronic : a moron
idiotic : an idiot
foolish : a fool
You can also call someone a dummy, dunce, nitwit, halfwit, nimrod, doofus, blockhead, numbskull, thickheaded...
add a skeleton here at some point
23 days ago