WordNet sense 1 ((of soil) soft and watery):

boggy, marshy, miry, mucky, muddy, sloppy, soggy, swampy, waterlogged, quaggy, sloughy

WordNet sense 2 (covered or soaked with a liquid such as water):

wet

WordNet sense 3 (easily squashed; resembling a sponge in having soft porous texture and compressibility):

spongy, squishy, spongelike

WordNet sense 4 (yielding readily to pressure or weight):

soft