(noun) A person of low general intelligence.
"Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?"
"In the first place God made idiots. This was for practice. Then he made school boards."
"He may look like an idiot and talk like an idiot but don't let that fool you. He really is an idiot."
"What a terrible era in which idiots govern the blind."