Knucklehead and Shithead

Knucklehead noun - A stupid person.

Shithead is a synonym for knucklehead in jackass topic. In some cases you can use "Shithead" instead a noun "Knucklehead", when it comes to topics like dumbass, dimwit.

Shithead noun - A stupid person; these words are used to express a low opinion of someone's intelligence.

Knucklehead is a synonym for shithead in jackass topic. You can use "Knucklehead" instead a noun "Shithead", if it concerns topics such as dumbass, dimwit.