solidity
so-lid-i-ty
noun
The state or quality of being firm, hard, and not liquid or gaseous.
"The wall's solidity ensured its long-term stability."
noun
The quality of being strong, stable, and reliable, often in an abstract sense.
"The company's financial solidity reassured its shareholders."
Thesaurus
Synonyms: solidness
Antonyms: hollowness, porosity, porousness