airhead

This term is highly informal and carries a derogatory, though sometimes playful, connotation. It suggests a lack of substance or intellectual depth, evoking the image of a head filled with air rather than brains. While it can be used as a harsh insult to dismiss someone's intelligence, it is frequently used in a teasing or affectionate manner among friends to describe someone who is scatterbrained or prone to absent-mindedness.

Because of its casual register, this word is inappropriate for professional or formal settings. It is often associated with stereotypes regarding youth or specific social archetypes, making it a socially charged term that can be perceived as belittling depending on the speaker's intent and the relationship between the interlocutors.