Definition & Meaning of "bonehead"in English

What is the origin of the term "bonehead" and how is it used?

"Bonehead" is an English slang insult that appeared in the early 20th century, combining "bone," suggesting hardness, with "head," implying someone's mind. The term conveys that a person is stupid, thick-headed, or stubbornly foolish, as if their skull prevents them from thinking clearly. It is commonly used in informal speech, often in frustration, teasing, or mild ridicule. The expression is mildly to moderately derogatory, insulting someone's intelligence or judgment without being deeply offensive.