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