Jittery (adjective)

Feeling or showing nervousness or anxiety, characterized by trembling or shaking.

Origin:

Originated in the early 20th century, of uncertain origin, it is likely a colloquialism.

Examples:

1. She was jittery before her big presentation.
2. He woke up jittery on the day of his wedding.
3. The jittery feeling was caused by the caffeine in the coffee.
4. The jittery athletes were pacing back and forth before the game.
5. The jittery stock market made investors nervous.