📖 WordNook

hardness

noun
  1. excessive sternness
    severity
  2. the quality of being difficult to do
    “They assigned a series of problems of increasing hardness.”
    ruggedness
  3. devoid of passion or feeling
    unfeelingnesscallousnesscallosityinsensibility
  4. 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”
  5. the property of being rigid and resistant to pressure