decorous
     adj 1: characterized by propriety and dignity and good taste in
            manners and conduct; "the tete-a-tete was decorous in
            the extreme" [ant: {indecorous}]
     2: 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" [syn: {becoming}, {comely}, {comme
        il faut}, {decent}, {seemly}]
Source: WordNet® 2.0