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EnglishEdit

 
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EtymologyEdit

From Middle English toughnesse, towghnesse, towghenesse, equivalent to tough +‎ -ness.

NounEdit

toughness (countable and uncountable, plural toughnesses)

  1. (uncountable) The state of being tough
  2. (physics, of a metal) Resistance to fracture when stressed
  3. A formidable difficulty

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