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

 

gentlemanly

 adjective
adjective
BrE BrE//ˈdʒentlmənli//
 
; NAmE NAmE//ˈdʒentlmənli//
 
(approving)
 
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behaving very well and showing very good manners; like a gentleman gentlemanly behaviour So far, the election campaign has been a very gentlemanly affair.
See the Oxford Advanced American Dictionary entry: gentlemanly