Definition of fool (fl)from The Free Dictionary by: Farlex
n.
1. One who is deficient in judgment, sense, or understanding.

2. One who acts unwisely on a given occasion: I was a fool to have quit my job.

3. One who has been tricked or made to appear ridiculous; a dupe: They made a
fool of me by pretending I had won.

4. Archaic A mentally deficient person; an idiot.