A knucklehead is a person who is very stupid or foolish. They are often the target of jokes, and people often call them names that are associated with stupidity.

  • He is a knucklehead for driving under the influence.

  • She is a knucklehead for wearing that dress to the party.

Definition of knucklehead


a stupid person; these words are used to express a low opinion of someone's intelligence


blockhead, bonehead, dumbass, dunce, dunderhead, fuckhead, hammerhead, loggerhead, lunkhead, muttonhead, numskull, shithead

Nearby Words

knucklehead Pronunciation in a video

Example Sentences for knucklehead

  • 1

    If you're an admin, don't be a knucklehead.

  • 2

    I guess one is always a knucklehead in training.

  • 3

    I deleted it once, but some knucklehead put it back.

  • 4

    It used a version of the Knucklehead OHV engine that powered the EL in form.

  • 5

    I would be a knucklehead to trust you without looking at sources, however.

  • 6

    Please state for the record whether you are at all related to Knucklehead Zoo.