Airhead

The slang term “airhead” is used to describe someone who is perceived as being unintelligent or lacking common sense. It is often used to refer to a person who is not very smart or has a tendency to be forgetful.

Here are two examples of how to use it in a sentence:

1. “Don’t bother asking Matt for help with math homework, he’s a complete airhead when it comes to numbers.”
2. “I can’t believe she forgot her own birthday, she can be such an airhead sometimes.”