noun (n)

• a shaky motion(noun.state)

  Synonym:
  palpitation, quiver, quivering, shaking, trembling, vibration
  

  source: wordnet30
• the quality of being unstable and insecure(noun.attribute)

  Example:
  The shakiness of the present regime.
  

  source: wordnet30
• Quality of being shaky.(noun)

  source: webster1913