ADJ-GRADED
(聲音或動作)震顫的，顫抖的，打戰的；（笑容）怯生生的，不自然的
If someone's voice, smile, or actions are tremulous, they are unsteady because the person is uncertain, afraid, or upset.
例句
She fidgeted in her chair as she took a deep, tremulous breath.
她在椅子上坐立不安，輕顫著深吸了一口氣。