toughness

Definitions of toughness
1

n enduring strength and energy

Synonyms:
stamina, staying power
Types:
legs
staying power
Type of:
endurance
the power to withstand hardship or stress

n the property of being big and strong

Synonyms:
huskiness, ruggedness
Type of:
strength
the property of being physically or mentally strong

n impressive difficulty

Synonyms:
formidability
Type of:
difficultness, difficulty
the quality of being difficult

n the elasticity and hardness of a metal object; its ability to absorb considerable energy before cracking

Synonyms:
temper
Type of:
elasticity, snap
the tendency of a body to return to its original shape after it has been stretched or compressed