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Hard or hardness may refer to:

See also[edit]

  • Slang sexual terms relating to genital erection:
  • Hardness, resistance of physical materials to decrease of thickness perpendicular to applied force
  • Hard water, water dissolved solids can cause several household and industrial problems
  • Being NP-hard, property of some math problems such that moderately increasing the count of items involved raises time-to-solution extremely disproportinately
  • HARD or H.A.R.D.:



Heh, es hawd - an example of hard from B.E. University.