tremulous - shaky
If a person’s voice or part of their body is unsteady or quivering, then they can be described as being ‘tremulous’. This is typically as a result of being nervous, uncertain, afraid, or upset over something. As such, this word implies a degree of emotional instability. Most commonly encountered in written English.
I did my best to hide my nerves at the job interview, but my hands were clearly a little tremulous.
Emily spoke tremulously as she began to tell me the news, so I immediately knew it was going to be something very upsetting.
In the meeting, an enraged Kevin pointed a tremulous finger at me and accused me of conspiring against him.