Definition of gentlemanly adjective from the Oxford Advanced American Dictionary

 

gentlemanly

 adjective
adjective
NAmE//ˈdʒɛntlmənli//
 
(approving)
 
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behaving very well and showing very good manners; like a gentleman gentlemanly behavior So far, the election campaign has been very gentlemanly.
See the Oxford Advanced Learner's Dictionary entry: gentlemanly