A goof is a silly fool. If you can't stop telling jokes, even after your math class has started, your teacher will think you're a goof.

There are many alternate words for goof, including dimwit, dummy, and nitwit. In other words, you should only call someone a goof if you mean to insult their intelligence. The mistakes a goof — or anyone — makes can also be called goofs: "I made such a goof when I was mixing this cake batter." Goof is a 1916 American invention, probably influenced by the English dialect goff, "foolish clown."

Definitions of goof
  1. noun
    a man who is a stupid incompetent fool
    synonyms: bozo, cuckoo, fathead, goofball, goose, zany
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    type of:
    fool, muggins, sap, saphead, tomfool
    a person who lacks good judgment
  2. noun
    a person who amuses others by ridiculous behavior
    synonyms: buffoon, clown, goofball, merry andrew
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    Emmett Kelly
    United States circus clown (1898-1979)
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    a clown or buffoon (after the Harlequin character in the commedia dell'arte)
    fool, jester, motley fool
    a professional clown employed to entertain a king or nobleman in the Middle Ages
    a clown whose face is covered with white make-up
    a buffoon in one of the old comedies; imitates others for ludicrous effect
    type of:
    comedian, comic
    a professional performer who tells jokes and performs comical acts
  3. verb
    commit a faux pas or a fault or make a serious mistake
    synonyms: blunder, boob, drop the ball, sin
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    type of:
    breach, break, go against, infract, offend, transgress, violate
    act in disregard of laws, rules, contracts, or promises
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