hardness (n.)the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale;
hardness (n.)a quality of water that contains dissolved mineral salts that prevent soap from lathering;
the costs of reducing hardness depend on the relative amounts of calcium and magnesium compounds that are present
hardness (n.)devoid of passion or feeling; hardheartedness;
Synonyms: unfeelingness /
callousness /
callosity /
insensibility hardness (n.)the quality of being difficult to do;
he assigned a series of problems of increasing hardness
Synonyms: ruggedness
hardness (n.)excessive sternness;
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