impropriety
🇺🇸
/ˌɪmprəˈpraɪəti/
🇬🇧
/ˌɪmprəˈpraɪəti/
Something that is not right or not suitable, especially in a professional or moral way.
The teacher was shocked by the student's behavior, which was a clear case of impropriety.
先生は生徒の行動にショックを受け、それは明らかな不適切な行為のケースでした。