Impolite

I think it is best not to be impolite.

It is impolite to elbow one's way through the crowd.

It's impolite to stare at people.

It was impolite of him not to say goodbye.

It was impolite of him to do so.

He is impolite, not to say rude.

He was impolite, not to say rude.

He is so impolite that everyone hates him.

It's very impolite of you to decline her invitation.

They consider it impolite to disagree with someone they don't know very well.