What you found are contemporary, modern meanings of the word. The word in its Greek root (taken over into Latin), idiota, simply means someone uninformed, uneducated. It did not in itself mean stupid or mentally deformed etc.For Brooks, I would add "asinine" from the latin asinus for "ass" or "donkey" -- a fitting word for a RINO who is more like a Democrat -- the donkey party...
Brooks is not stupid or retarded. Hes just sadly uninformed, naive. Idiot. Poster-boy for idiots around the world.