Meaning : Characterized by propriety and dignity and good taste in manners and conduct.
Example :
The tete-a-tete was decorous in the extreme.
Lacking propriety and good taste in manners and conduct.
Indecorous behavior.Meaning : According with custom or propriety.
Example :
Her becoming modesty.
Comely behavior.
It is not comme il faut for a gentleman to be constantly asking for money.
Seemly behavior.
Synonyms : becoming, comely, comme il faut, seemly