HARDNESS

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Scrabble letter values: H₄A₁R₁D₂N₁E₁S₁S₁ = 12

Definition

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

“not easily scratched”
“measured on Mohs scale”
“the costs of reducing hardness depend on the relative amounts of calcium and magnesium compounds that are present”