From Longman Dictionary of Contemporary Englishgentlemanlygen‧tle‧man‧ly /ˈdʒentlmənli/ adjective POLITEKINDa man who is gentlemanly speaks and behaves politely, and treats other people with respect
Examples from the Corpus
gentlemanly• But more importantly, he suspected that Heathcliff was hiding his true wickedness under his gentlemanly appearance.• Such a gentlemanly boy Frank is, for these circumstances.• Colleagues described Dorrance as a gentlemanly, compassionate man with a lot of moral commitment.• Because you imagine that Martin will do the gentlemanly thing and keep you out of it?• Once inside a gentlemanly usher gave our party good seats. 