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.
source: WordNet 3.0
The state or quality of being solid; density; consistency, -- opposed to fluidity; compactness; fullness of matter, -- opposed to openness or hollowness; strength; soundness, -- opposed to weakness or instability; the primary quality or affection of matter by which its particles exclude or resist all others; hardness; massiveness.
