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 character in the horror movie let out a keening scream that sent chills down the audience's spine.

The sailor set sail with a keening longing for adventure, eager to explore uncharted waters.