ferm’ness.

Closeness or denseness of texture or structure; compactness; hardness; solidity; as the firmness of wood, stone, cloth or other substance.

Stability; strength; as the firmness of a union, or of a confederacy.

Steadfastness; constancy; fixedness; as the firmness of a purpose or resolution; the firmness of a man, or of his courage; firmness of mind or soul.

Certainty; soundness; as the firmness of notions or opinions.