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Definitions of hardness
  1. noun
    devoid of passion or feeling; hardheartedness
  2. noun
    excessive sternness
  3. noun
    the quality of being difficult to do
    "he assigned a series of problems of increasing hardness"

    Similar: 

  4. noun
    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"
    type of:
  5. noun
    the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale
    Opposite:
Antonyms of hardness
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