Definition of

Toughness

  1. (noun, attribute) impressive difficulty
  2. (noun, attribute) the elasticity and hardness of a metal object; its ability to absorb considerable energy before cracking
  3. (noun, attribute) the property of being big and strong
  4. (noun, attribute) enduring strength and energy

via WordNet, Princeton University

Alternate forms of Toughness

Derivations: tough

Hyponyms: legs

Hypernyms: difficultness, difficulty, elasticity, endurance, snap, strength

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