Of ground, soil, etc.: lacking structure or cohesion; excessively soft, loose, or boggy; poorly oxygenated. Also figurative and in figurative…

Of soil: soft, friable, easily worked; rich, loamy.

Of land, etc.: Cold and wet; uncongenial through retaining stagnant moisture.

Of ground or soil: Of a soft adhesive nature; fat, rich.

Of ground, a road, etc.: that clings or hangs heavily to the spade, feet, wheels, etc., and thus impedes motion or manipulation; soft and tenacious…

Of land or soil: mellow; easily-worked; loamy.

Mature; ripened, softened; made mellow, esp. as the result of age.

Esp. of sand or soil: yielding, prone to sink beneath one's weight. Cf. sinking, adj. 1a.