n. | 1. | The quality or state of being tough. |
Noun | 1. | toughness - enduring strength and energy Synonyms: stamina, staying power |
2. | toughness - the property of being big and strong Synonyms: huskiness, ruggedness | |
3. | toughness - the elasticity and hardness of a metal object; its ability to absorb considerable energy before cracking Synonyms: temper | |
4. | toughness - impressive difficulty Synonyms: formidability |