FIRM'NESS, noun ferm'ness. 1. Closeness or denseness of texture or structure; compactness; hardness; solidity; as the firmness of wood, stone, cloth or other substance. 2. Stability; strength; as the firmness of a union, or of a confederacy. 3. 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. 4. Certainty; soundness; as the firmness of notions or opinions.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI