Dictionary:

spongy

  (spŭn'jē)

Resembling a sponge in elasticity, absorbency, or porousness.

adjective

Yielding easily to pressure or weight; not firm: mushy, pappy¹, pulpous, pulpy, quaggy, soft, squashy, squishy, yielding. See resist/yield.

Definition: cushioned, absorbent
Antonyms: hard, impermeable, inflexible, solid

Of spongelike appearance or texture.

• s. degeneration — see spongy degeneration.