An example of decorum is to show good table manners.
The formalities and decorums of a military funeral.
There was decorum in the countenance he wore.
Perhaps you could respond to Andy's points and restore a little decorum here.
She accepted his report, not without obvious sadness but with business-like decorum and no sign of tears.
He was a regular observer of religious rites, took great pains to secure decorum in the services of the church, and was generous in almsgiving both within his empire and without.
When this ebony bird flew in it was beguiling my sad fancy into smiling by the grave and stern decorum of the countenance it wore.