1. Noun
The quality or state of being tough.
2. Noun
the elasticity and hardness of a metal object; its ability to absorb considerable energy before cracking
Vocabulary classified under Economics
3. Noun
the property of being big and strong
Vocabulary classified under Engineering
4. Noun
enduring strength and energy
Vocabulary classified under Engineering
5. Noun
impressive difficulty
Vocabulary classified under Environmental science
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