ไม่ถูกต้อง Anglais:

It is highly improper.

"Toilet paper hung in improper overhand fashion"?

It was thought improper for a teacher to sit at her desk during a lesson.

His improper conduct at the Minister's party could ruin his diplomatic career.

With improper use, he damaged the machine.

The Court judged that there had been no improper conduct by the club.

They used their power for an improper purpose.

This unexpected malfunctioning of the system was caused by improper wiring.

It is improper to impose sanctions upon the union.

In present day Japan, "alchemy" is only used metaphorically; to refer to improper means of making money by politicians or religious hucksters with no morals or shame.

Later, it happened that there was some gossip at home, and my mother suspected that she had written something improper; after that she would not have her letters written for her.

Improper grounding can make a microphone lethal to touch. Several singers have actually died this way.