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

 

louche

 adjective
adjective
BrE BrE//luːʃ//
 
; NAmE NAmE//luːʃ//
 
(especially British English, formal)
 
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not socially acceptable, but often still attractive despite this Word Origin early 19th cent.: from French, literally ‘squinting’.
See the Oxford Advanced American Dictionary entry: louche