Dictionary definition · fool
noun
- a person who lacks good judgment
- a person who is gullible and easy to take advantage of
- a professional clown employed to entertain a king or nobleman in the Middle Ages
verb
- make a fool or dupe of
- spend frivolously and unwisely"Fritter away one's inheritance"
- fool or hoax"The immigrant was duped because he trusted everyone"
- indulge in horseplay"Enough horsing around — let's get back to work!"
Source: Open English WordNet (CC BY 4.0).