decorous (
http://definr.com/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]