firmness.

Rigidity, inflexibility; viscosity (of liquids and semi-liquids); density, heaviness, compactness (of soil). Also figurative.

rigidity.

Of material objects: stiffness, rigidity; hardness; (also) an instance of this. Obsolete.

The quality of being unpliable; inflexibility.

The quality, state, or condition of being rigid; stiffness, hardness.

The quality or condition of being inflexible; incapability of being bent; unyielding stiffness, rigidity; firmness of purpose, obstinacy.

The quality of being unpliant; lack of flexibility or adaptability.

fig.