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Comprehensive
Dictionary Suite
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featherbrain a foolish or flighty person; scatterbrain.
flibbertigibbet a foolish, flighty, or talkative person.
harebrained reckless or flighty.
scatterbrain someone unable to organize, concentrate on, or remember things; flighty person.
serious earnest, thoughtful, or determined; not frivolous, silly, or flighty. [1/6 definitions]
stable1 consistent or steady in character, mood, or behavior; not flighty or insane. [1/4 definitions]