WordNet sense 1 (the state in which a substance has no tendency to flow under moderate stress; resists forces (such as compression) that tend to deform it; and retains a definite size and shape):

solidness

WordNet sense 2 (providing abundant nourishment):

hearty, satisfying, square, substantial

WordNet sense 3 (conducive to or characteristic of physical or moral well-being):

wholesome

WordNet sense 4 (of good quality and condition; solidly built):

strong

WordNet sense 5 (in good condition; free from defect or damage or decay):

sound

WordNet sense 6 (being the same substance throughout):

massive

WordNet sense 7 (congealed into jelly; solidified by cooling):

congealed

WordNet sense 8 (formed by the coalescence of particles):

concrete

WordNet sense 9 (concerned with work or important matters rather than play or trivialities):

serious

WordNet sense 10 (of the same color throughout):

self-colored, self-coloured

WordNet sense 11 (all of the same or similar kind or nature):

homogenous

WordNet sense 12 (not soft or yielding to pressure):

firm

WordNet sense 13 (resisting weight or pressure):

hard

WordNet sense 14 (morally admirable):

upstanding, worthy

WordNet sense 15 (morally admirable):

good

WordNet sense 16 (acting together as a single undiversified whole):

unanimous, whole

WordNet sense 17 (not diversified):

undiversified

WordNet sense 18 (having three dimensions):

cubic, three-dimensional

WordNet sense 19 (not clear; not transmitting or reflecting light or radiant energy):

opaque