solidity
/səˈlɪdɪtɪ/noun
mass noun
1- the quality or state of being firm or strong in structure（结构）坚固; 紧密：
the sheer strength and solidity of Romanesque architecture.
罗马式建筑的垂直强度和坚固性。
1.1
- the quality of being substantial or reliable in character（性格）可靠; 真实：
he exuded an aura of reassuring solidity.
他浑身散发出一种安全可靠的感觉。