Definitions of fool:

  • noun:   a person who lacks good judgment
  • noun:   a person who is gullible and easy to take advantage of
  • noun:   a professional clown employed to entertain a king or nobleman in the middle ages
  • verb:   make a fool or dupe of
  • verb:   indulge in horseplay
    Example: "The bored children were fooling about"
  • verb:   fool or hoax
    Example: "You can't fool me!"
  • verb:   spend frivolously and unwisely