1. 
[syn: rascality, shiftiness, slipperiness, trickiness]
2.  the quality of being changeable in direction; 
- Example: "the shiftiness of the wind caused the boat to veer unpredictably"
The Collaborative International Dictionary of English v.0.48:
Shiftiness \Shift"i*ness\, n.
   The quality or state of being shifty.
   [1913 Webster]
         Diplomatic shiftiness and political versatility. --J.
                                                  A. Syminds.
   [1913 Webster]
WordNet (r) 3.0 (2006):
shiftiness
    n 1: the quality of being a slippery rascal [syn: rascality,
         shiftiness, slipperiness, trickiness]
    2: the quality of being changeable in direction; "the shiftiness
       of the wind caused the boat to veer unpredictably"