Oaf (noun)

A clumsy or stupid person; a lout; an awkward or uncultivated person.

Origin:

Derived from the old english word "āf" which means "a fool, an idiot", it was first recorded in the 14th century.

Examples:

1. He may not be the brightest bulb in the box, but he's no oaf.
2. He is an oaf, He broke the vase without noticing it.
3. She was embarrassed by her oafish brother's behavior at the party.
4. He was an oaf, a clumsy and awkward person who always made mistakes.
5. The oaf spilled his drink all over the new carpet.