Source : Webster's Revised Unabridged Dictionary (1913)

Shakiness \Shak"i*ness\, n.
   Quality of being shaky.

Source : WordNet®

shakiness
     n 1: a shaky motion; "the shaking of his fingers as he lit his
          pipe" [syn: {shaking}, {trembling}, {quiver}, {quivering},
           {vibration}, {palpitation}]
     2: the quality of being unstable and insecure; "the shakiness
        of the present regime" [syn: {ricketiness}]