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Giddy and talkative; foolish.

rat′tle·brain′ (-brān′) n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
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"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
It is half educated, rattlebrained leaders who must lead if there are no better, that foment discord, create issues, and rush in headlong where angels fear to tread.
He once replied to a constituent that, "the law does not permit me to take action against stupid or rattlebrained decisions either by teachers, administrators, or school board members.