The Collaborative International Dictionary of English v.0.48:

Springy \Spring"y\ (-[y^]), a. [Compar. Springier
   (-[i^]*[~e]r); superl. Springiest.] [From Spring.]
   1. Resembling, having the qualities of, or pertaining to, a
      spring; elastic; as, springy steel; a springy step.
      [1913 Webster]

            Though her little frame was slight, it was firm and
            springy.                              --Sir W.
                                                  Scott.
      [1913 Webster]

   2. Abounding with springs or fountains; wet; spongy; as,
      springy land.
      [1913 Webster]

WordNet (r) 3.0 (2006):

springy
    adj 1: elastic; rebounds readily; "clean bouncy hair"; "a lively
           tennis ball"; "as resilient as seasoned hickory";
           "springy turf" [syn: bouncy, live, lively,
           resilient, springy]
    2: (of movements) light and confidently active; "he walked away
       with a springy step"

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "springy":
   adaptable, adaptive, bendable, bending, bouncy, buoyant, compliant,
   ductile, elastic, extensible, extensile, fabricable, facile,
   fictile, flexible, flexile, flexuous, formable, formative, giving,
   impressible, impressionable, like putty, limber, lissome, lithe,
   lithesome, lively, malleable, moldable, plastic, pliable, pliant,
   rebounding, receptive, recoiling, resilient, responsive, sensitive,
   sequacious, shapable, stretch, stretchable, stretchy, submissive,
   supple, susceptible, tractable, tractile, whippy, willowy,
   yielding