1.Definition: enduring strength and energy

Related Noun(s):stamina

Category: General

2.Definition: impressive difficulty

Related Noun(s):formidability

Category: General

3.Definition: the elasticity and hardness of a metal object; its ability to absorb considerable energy before cracking

Related Noun(s):temper

Category: General

4.Definition: the property of being big and strong

Related Noun(s):huskiness, ruggedness

Category: General