Tremor
Definition 1 of 3
Pro Tip 1/2
Emotional Indicator
Tremor often indicates nervousness or excitement when describing a person's voice. You could hear the tremor of excitement in her voice as she spoke.
Pro Tip 2/2
Subtle Disturbance
'Tremor' suggests a movement that is barely noticeable, not a strong shake. A tremor passed through the audience at the unexpected news.