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 cries of the wounded soldier could be heard from the battlefield.

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

The air raid siren's keening pierced through the city, signaling imminent danger.

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

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