Definition of ditzy adjective from the Oxford Advanced Learner's Dictionary

 

ditzy

 adjective
(also ditsy)adjective
BrE BrE//ˈdɪtsi//
 
; NAmE NAmE//ˈdɪtsi//
 
(informal, especially North American English)
 
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(usually of a woman) silly; not able to be trusted to remember things or to think in an organized way Word Origin 1970s: of unknown origin.
See the Oxford Advanced American Dictionary entry: ditzy