lunkhead

Meaning: (noun) a stupid or dull-witted person : dolt

Pronounced: ˈləŋk-ˌhed

In a sentence: “Where I lived, in Central Square, Cambridge, you had the working class and the university life—you'd have to be a lunkhead not to be keenly aware of it,” says [Ben] Affleck.

Quick way to remember: lunkhead implies someone is clumsy or foolish, often in an endearing way