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TOEFL BNC: 12304 COCA: 17667
hardness
noun [U] /ˈhɑː(r)dnəs/
  1. 1
    the quality of being stiff, firm, and not easy to bend or break

    The softness or hardness of these mattresses can vary.

    Sapphire's hardness is second only to diamond.

     Synonyms and related words
    Solid, stiff or hard:solid, stiff, hard...
  2. 2
    the quality of being unkind or cruel

    hardness of heart

     Synonyms and related words
  3. 3
    the extent to which water contains a lot of minerals

    The hardness of water is determined by the amount of calcium and magnesium present in the water.

     Synonyms and related words
TOEFL BNC: 12304 COCA: 17667
TOEFL BNC: 12304 COCA: 17667

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