idiot

n.

  1. A man in private station, as distinguished from one holding a public office.
  2. An unlearned, ignorant, or simple person, as distinguished from the educated; an ignoramus.
  3. A human being destitute of the ordinary intellectual powers, whether congenital, developmental, or accidental; commonly, a person without understanding from birth; a natural fool; a natural; an innocent.
  4. A fool; a simpleton; -- a term of reproach.