toughness
//ˈtʌf.nəs//
Noun
toughnessSingular
1
The quality of being strong enough to withstand adverse conditions or rough handling.
The toughness of this material makes it ideal for outdoor use.
2
The quality of being able to deal with hardship or difficult situations; mental or emotional resilience.
Her mental toughness helped her overcome the challenges of starting a new business.
3
The quality of being difficult to cut, chew, or break; physical durability.
The toughness of this leather makes it ideal for work boots.