shrill

The noise of the machine was shrill and very annoying. Ronald and his friends began throwing rocks at the machine. Later, the balding Mr. Brogohnson tapped it with his foot. The noise continued. Shrugging, he continued on his way. Eventually, the lovely Thomson girl came by, singing a little tune. The machine stopped its shrill shriek, amazed by her singing. One day, it thought, it would gather up the courage to say hello to her.