The meaning of this question is unclear. Who, do you think, "lost propriety"?
Prudish means excessively and mistakenly concerned with propriety.
Propriety means conformity to established standards of good or proper behavior or manners, appropriateness to the purpose or circumstance or rightness and justice. A synonym of propriety is appropriateness.
It is important to respect the propriety of the workplace by maintaining professional behavior at all times.
Because we are trying to improve the propriety of the school, we have initiated a dress code.
Carrie desperately wanted to speak her mind, but to do so would show utter lack of propriety!
A Matter of Propriety - 2013 was released on: USA: 26 November 2013 (Philadelphia, Pennsylvania) (premiere)
propriety in manners and conduct
the objective of propriety mgt audit is to identify the loopholes in administrative rules and regulations, and to suggest methods for improving the execution of plans and projects.
You use the word propriety to describe something as being socially or morally acceptable: Our neighborhood is quite strict about the propriety of the appearance of homeowners property.
Legality, Propriety and Correctness
modest