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Noun: toughness  túf-nus
  1. Enduring strength and energy
    "lacking in toughness";
    - stamina, staying power, stickability
     
  2. The property of being big and strong
    - huskiness, ruggedness
     
  3. The elasticity and hardness of a metal object; its ability to absorb considerable energy before cracking
    - temper
     
  4. Impressive difficulty
    - formidability

Type of: difficultness, difficulty, elasticity, endurance, snap, strength

Encyclopedia: Toughness