featherbrain
/ˈfɛðərˌbreɪn/
noun
- A silly or forgetful person; someone who is not very smart or who acts without thinking.
- Don't be such a featherbrain—you left your keys in the door again!
- She called herself a featherbrain after mixing up the meeting times.
- He's a bit of a featherbrain, always forgetting appointments.
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