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Giddy and talkative; foolish.
rat′tle·brain′ (-brān′) n.
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|Adj.||1.||rattlebrained - lacking sense or discretion; "his rattlebrained crackpot ideas"; "how rattlepated I am! I've forgotten what I came for"- Glenway Westcott|
foolish - devoid of good sense or judgment; "foolish remarks"; "a foolish decision"