solidity

noun

1. the consistency of a solid

   noun.attribute

   Synonyms solidness

   Antonyms porosity porousness

   Source: WordNet 3.0

2. state of having the interior filled with matter

   noun.state

   Antonyms hollowness

   Source: WordNet 3.0

3. the quality of being solid and reliable financially or factually or morally

   noun.attribute

   Examples

   The solidity of the evidence worked in his favor.

   Source: WordNet 3.0

4. The state or quality of being solid; density; consistency, -- opposed to <i>fluidity</i>; compactness; fullness of matter, -- opposed to <i>openness</i> or <i>hollowness</i>; strength; soundness, -- opposed to <i>weakness</i> or <i>instability</i>; the primary quality or affection of matter by which its particles exclude or resist all others; hardness; massiveness.

   noun

   Source: webster1913