Definition of scatterbrain noun from the Oxford Advanced American Dictionary

 

scatterbrain

 noun
noun
NAmE//ˈskæt̮ərˌbreɪn//
 
(informal)
 
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a person who is always losing or forgetting things and cannot think in an organized way
scatterbrained
 
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adjective
See the Oxford Advanced Learner's Dictionary entry: scatterbrain