Tremulous (adjective)

Characterized by trembling or being unsteady; timid, nervous or fearful.

Origin:

From the latin word "tremulus" meaning "shivering, trembling".

Examples:

1. The old man's voice was tremulous with emotion.
2. She felt tremulous with fear as she walked through the dark alley.
3. His hands were tremulous with age.
4. The tremulous voice of the singer made her performance unforgettable.
5. The tremulous movement of the leaves in the wind was beautiful.