tremulent
/ˈtrɛmjʊlənt/Definitions
1. adjective
causing or characterized by trembling or unsteadiness
“The tremulent hand of the elderly artist struggled to hold the paintbrush.”
2. noun
a person who is prone to trembling or unsteadiness, especially due to fear or emotion
“The actor was a bit of a tremulent, which made it difficult for him to perform under pressure.”