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toughness

toughness - noun

  1. The fact or condition of being rigorous and unsparing: austerity, hardness, harshness, rigidity, rigor, rigorousness, severity, sternness, strictness, stringency. See easy.
  2. Unwavering firmness of character, action, or will: decidedness, decision, decisiveness, determination, firmness, purpose, purposefulness, resoluteness, resolution, resolve, will, willpower. See certain. strong.