An indecorous or unbecoming action or proceeding; an impropriety, a violation of the rules of behaviour proper to the sex, age, or character of the…

= indecency, n. 1b.

With an and plural. An instance of this; an unbecoming or unseemly action, trait, etc.

A departure from propriety, an extravagance. Obsolete.

with an and plural. An instance of improper language, conduct, etc.; a breach of propriety.

transferred. A violation of some standard of taste or propriety.