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.

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

The scientist dedicated countless hours to research, driven by a keening curiosity to unlock the mysteries of the universe.

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

The injured bird emitted a keening cry, signaling its distress.