hardness
Definitions
The quality or condition of being physically solid, firm, and resistant to pressure or cutting.
The degree of mineral resistance to scratching or abrasion, typically measured on the Mohs scale.
The quality of being difficult to endure, understand, or perform; severity or rigor.
Examples
The diamond is known for its extreme hardness, making it the hardest natural substance on Earth.
The hardness of the water in this region can cause mineral buildup in pipes.
Despite the hardness of his exterior, he was a deeply compassionate person at heart.
Synonyms
firmness rigidity solidity toughness stiffness durability inflexibility
Antonyms
softness malleability flexibility pliancy tenderness weakness suppleness