a person incapable of serious, connected thought.
Also, scatterbrains.

1780–90; scatter + brain

scatterbrained, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
scatterbrain (ˈskætəˌbreɪn)
a person who is incapable of serious thought or concentration

scatterbrained (ˈskætəˌbreɪnd)
exhibiting or characterized by lack of serious thought or concentration; disorganized; silly

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Slang Dictionary

scatterbrain definition

  1. n.
    a forgetful person; someone who is mentally disorganized. : Aunt Martha is a real scatterbrain. She always forgets where her glasses are.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
But he can also be scatterbrained, antisocial and arrogant.
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