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 patient lay in the hospital bed, his keening thoughts consumed by the desire to be healthy again.

The lonely lighthouse emitted a keening beam of light that swept across the dark sea.

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

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

The keening tone of his voice conveyed the depth of his heartbreak.