Conduct, as determined, not by principle, but by breeding. The word seems to be somewhat loosely used in Dr. Jamrach Holobom's translation of the following lines from the Dies Irae:
Recordare, Jesu pie,
Quod sum causa tuae viae.
Ne me perdas illa die.
Pray remember, sacred Savior,
Whose the thoughtless hand that gave your
Death-blow. Pardon such behavior.