Etymology
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toughness (n.)

mid-15c., from tough (adj.) + -ness.

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Definitions of toughness

toughness (n.)
enduring strength and energy;
Synonyms: stamina / staying power
toughness (n.)
the property of being big and strong;
Synonyms: huskiness / ruggedness
toughness (n.)
the elasticity and hardness of a metal object; its ability to absorb considerable energy before cracking;
Synonyms: temper
toughness (n.)
impressive difficulty;
Synonyms: formidability
From wordnet.princeton.edu