1. The property of being rigid and resistant to pressure;
    Not easily scratched;
    Measured on Mohs scale (synset 104945025)
  2. A quality of water that contains dissolved mineral salts that prevent soap from lathering (synset 104944764)
    "the costs of reducing hardness depend on the relative amounts of calcium and magnesium compounds that are present"
  3. Devoid of passion or feeling;
    Hardheartedness (synset 104851856)
  4. The quality of being difficult to do (synset 104717864)
    "he assigned a series of problems of increasing hardness"; "the ruggedness of his exams caused half the class to fail"
  5. Excessive sternness (synset 104647089)
    "severity of character"; "the harshness of his punishment was inhuman"; "the rigors of boot camp"

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