solidness

(n) 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 solid state, solid,
(n) the consistency of a solid solidity,
(n) the quality of being substantial or having substance substantiality, substantialness,
(n) the quality of being solid and reliable financially or factually or morally
- the solidity of the evidence worked in his favor
- the solidness of her faith gave her enduring hope
solidity,

solid state solid solidity substantiality substantialness

porosity porousness insubstantiality