HARDNESS

Definition

1. noun the property of being rigid and resistant to pressure.
2. noun a quality of water that contains dissolved mineral salts that prevent soap from lathering.
3. noun devoid of passion or feeling. — synonyms: unfeelingness, callousness, callosity, insensibility
4. noun the quality of being difficult to do. — synonyms: ruggedness
5. noun excessive sternness. — synonyms: severity, severeness, harshness, rigor, rigour, rigorousness, rigourousness, inclemency