1. (noun) fool, sap, saphead, muggins, tomfool
a person who lacks good judgment
2. (noun) chump, fool, gull, mark, patsy, fall guy, sucker, soft touch, mug
a person who is gullible and easy to take advantage of
3. (verb) jester, fool, motley fool
a professional clown employed to entertain a king or nobleman in the Middle Ages
4. (verb) fool, gull, befool
make a fool or dupe of
5. (verb) fritter, frivol away, dissipate, shoot, fritter away, fool, fool away
spend frivolously and unwisely
"Fritter away one's inheritance"
6. (verb) gull, dupe, slang, befool, cod, fool, put on, take in, put one over, put one across
fool or hoax
"The immigrant was duped because he trusted everyone"; "You can't fool me!"
7. (verb) horse around, arse around, fool around, fool
indulge in horseplay
"Enough horsing around--let's get back to work!"; "The bored children were fooling about"
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Definition of 'FOOL' 
