ADJ-GRADED (声音或动作)震颤的,颤抖的,打战的;(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. (声音或动作)震颤的,颤抖的,打战的;(笑容)怯生生的,不自然的 [literary]
She fidgeted in her chair as she took a deep, tremulous breath.