toughness Meaning, Definition & Usage

1. noun enduring strength and energy
   stamina; staying power.
   
2. noun the property of being big and strong
   huskiness; ruggedness.
   
3. noun the elasticity and hardness of a metal object; its ability to absorb considerable energy before cracking
   temper.
   
4. noun impressive difficulty
   formidability.
   

WordNet