Source : Webster's Revised Unabridged Dictionary (1913)

Suppleness \Sup"ple*ness\, n.
   The quality or state of being supple; flexibility;
   pliableness; pliancy.

Source : WordNet®

suppleness
     n 1: the gracefulness of a person or animal that is flexible and
          supple [syn: {lissomeness}, {litheness}]
     2: the property of being pliant [syn: {pliancy}, {pliantness}]