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

 

abstruse

 adjective
adjective
BrE BrE//əbˈstruːs//
 
; NAmE NAmE//əbˈstruːs//
 
; BrE BrE//æbˈstruːs//
 
; NAmE NAmE//æbˈstruːs//
 
(formal, often disapproving)
 
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difficult to understand an abstruse argument Word Origin late 16th cent.: from Latin abstrusus ‘put away, hidden’, from abstrudere ‘conceal’, from ab- ‘from’ + trudere ‘to push’.
See the Oxford Advanced American Dictionary entry: abstruse