shaking
shak-ing
verb
Moving rapidly and uncontrollably back and forth or up and down.
"The old bridge was shaking in the wind."
noun
An act or period of trembling or vibrating, often due to fear or cold.
"She felt a slight shaking in her knees."
Thesaurus
Synonyms: shakiness, vibration, trembling, palpitation, quiver, quivering