Oh, they know it in their hearts, though they think themselves bound to blame you by their silly superstitions about morality and propriety and so forth.
I, who sacrificed all my inclinations to womanly virtue and propriety!
…above suspicion to act as your chaperone; and even the Times must sometimes thank its stars that new plays are not produced every day, since after each such event its gravity is compromised, its platitude turned to epigram, its portentousness to wit, its propriety to elegance, and even its decorum into naughtiness by criticisms which the traditions of the paper do not allow you to sign at the end, but which you take care to sign with the most extravagant flourishes between the lines.
There are no more uses of "propriety" in the book.
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While she took comfort in propriety, he saw it as a straitjacket.
She was known for losing all sense of propriety once she had a few drinks.