Impropriety

01 n. The quality of being improper; unfitness or unsuitableness to character, time place, or circumstances; as, impropriety of behavior or manners.

pl. Improprieties ((#))

1.
The quality of being improper; unfitness or unsuitableness to character, time place, or circumstances; as, impropriety of behavior or manners.
2.
That which is improper; an unsuitable or improper act, or an inaccurate use of language.
“But every language has likewise its improprieties and absurdities.” — Johnson.

“Many gross improprieties, however authorized by practice, ought to be discarded.” — Swift.