birdbrain

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Definitions from WordNet

Noun birdbrain has 1 sense

addle-head, addlehead, loon, birdbrain - a person with confused ideas; incapable of serious thought
--₁ is a kind of misfit

Definitions from the Web

Birdbrain

Part of Speech: Noun

Sense: A person who is considered foolish or lacks intelligence.

Usage: This term is usually used in a derogatory manner to describe someone who is perceived as being unintelligent or naive.

Example sentence: Don't listen to him, he's such a birdbrain!