toughness

Etymology

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

noun

  1. (uncountable) The state of being tough.
    1. (materials science, physics, of a metal) Resistance to fracture when stressed, or the degree of such resistance.
    2. (psychologically, emotionally, or biologically) Fortitude; hardiness; mettle.
  2. A formidable difficulty.

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