
Tremor
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.
Subtle Disturbance
'Tremor' suggests a movement that is barely noticeable, not a strong shake.

A tremor passed through the audience at the unexpected news.
Compare with
ConvulsionQuiverShakeShudderSpasmTrembleTwitchVibration
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