Pronunciation: (spun'jē),[key] —adj.,-gi•er, -gi•est. 1. of the nature of or resembling a sponge; light, porous, and elastic or readily compressible, as pith or bread.
2. having the absorbent characteristics of a sponge; absorbing or holding liquid or yielding liquid when pressed.
3. of or pertaining to a sponge.
4. lacking in firmness or solidity: spongy wood; a spongy feeling from the car brakes. 5. moist and soft; soggy: spongy ground. 6. porous but hard, as bone.