Keening

The keening whistle of the tea kettle signaled that the water had boiled.

The keening whistle of the teapot signaled that the water was boiling.

As the fog rolled in, a keening foghorn warned ships of the treacherous rocks ahead.

The refugee glanced back at his war-torn homeland with keening eyes, filled with longing for a peaceful life.

The widow sat alone in her empty house, keening softly for the husband she had lost.

The keening shriek of the fireworks lit up the night sky.

The old television emitted a high-pitched keening noise whenever it was turned on.