Impropriety (noun)

1. The quality or state of being improper or inappropriate.
2. A violation of etiquette or good manners.
3. A breach of accepted moral standards or codes of conduct.

Origin:

From french impropriété, from in- 'not' + propriété 'property'.

Examples:

1. The email was considered an impropriety and resulted in disciplinary action.
2. The party was marked by several instances of impropriety, including rude behavior and excessive drinking.
3. The financial impropriety came to light during the audit.
4. The impropriety of the situation was not lost on anyone in the room.
5. The impropriety of the request was met with disbelief.