Definition of screwball noun from the Oxford Advanced Learner's Dictionary

 

screwball

 noun
noun
BrE BrE//ˈskruːbɔːl//
 
; NAmE NAmE//ˈskruːbɔːl//
 
(informal, especially North American English) Describing strange traits
 
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a strange or crazy person That guy’s a complete screwball. See related entries: Describing strange traits
See the Oxford Advanced American Dictionary entry: screwball