1. 
[syn: shaking, shakiness, trembling, quiver, quivering, vibration, palpitation]
2.  the quality of being unstable and insecure; 
- Example: "the shakiness of the present regime"
The Collaborative International Dictionary of English v.0.48:
Shakiness \Shak"i*ness\, n.
   Quality of being shaky.
   [1913 Webster]
WordNet (r) 3.0 (2006):
shakiness
    n 1: a shaky motion; "the shaking of his fingers as he lit his
         pipe" [syn: shaking, shakiness, trembling, quiver,
         quivering, vibration, palpitation]
    2: the quality of being unstable and insecure; "the shakiness of
       the present regime"