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airbrain

air·brain

Today it means: An airhead; a foolish, silly, or unintelligent person. Full definition →

First used 20th c.

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The story

From air + brain.

First known use, by meaning

from 20th c. An airhead; a foolish, silly, or unintelligent person.

Etymology from Wiktionary, CC BY-SA 4.0.