This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of, being, pertaining to, or resembling a gentleman or gentlemen.

ad. In the manner or with the behavior of a gentleman; with social grace, politely.

Like a gentleman; being or befitting a gentleman, or a man of good birth or good breeding, or both; polite; complaisant: as, a gentlemanly officer; gentlemanly manners.

Synonyms Manly, Manful, etc. See masculine.

adj. befitting a man of good breeding

"He did not mind their sowing of wild oats if they were what he called gentlemanly wild oats, and merely got them talked about as gay young dogs, and he was always generous with an extra cheque if they got into difficulties; but he would not have foolhardy, quixotic affairs at all."

refined   

courteous    affable    considerate    well-bred    courtly