decorous -- (characterized by propriety and dignity and good taste in manners and conduct; "the tete-a-tete was decorous in the extreme")
becoming, comely, comme il faut, decent, decorous, seemly -- (according with custom or propriety; "her becoming modesty"; "comely behavior"; "it is not comme il faut for a gentleman to be constantly asking for money"; "a decent burial"; "seemly behavior")
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