IDIOT- DEFINED - a stupid person. -a person of low intelligence
OR
Idiot, from the Greek idios ("private" or "one's own"), is the oldest of these words, and has been in continual use since the 14th century. Over the years idiot has taken on a number of meanings, ranging from "an ignorant or unschooled person" to "jester, professional fool" to "Stimpy" (of "Ren and" fame).