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the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale
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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"
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devoid of passion or feeling; hardheartedness
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the quality of being difficult to do;
"he assigned a series of problems of increasing hardness"
"the ruggedness of his exams caused half the class to fail"
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excessive sternness;
"severity of character"
"the harshness of his punishment was inhuman"
"the rigors of boot camp"
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