Pronunciation: /ˈkrækˌbreɪn/
noun a person who is considered to be eccentric or foolish
A1 My grandmother always used to call me a crackbrain when I did something silly.
A2 The teacher scolded the student for being a crackbrain and not paying attention in class.
B1 Despite his reputation as a crackbrain, he was actually a brilliant inventor.
B2 The author's eccentricity led many to label him as a crackbrain, but his work was highly respected.
C1 The professor's crackbrain theories were initially dismissed, but later proved to be groundbreaking.
C2 The artist's reputation as a crackbrain only added to the allure of his avant-garde creations.
formal It is inappropriate to refer to someone as a crackbrain in a professional setting.
informal I can't believe he said that, what a crackbrain!
slang She's acting like a total crackbrain lately.
figurative His crackbrain ideas always lead to trouble.
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