Definitions for "Toughness"
A measure of a material's ability to absorb work, or the actual work per unit volume or unit mass of material that is required to rupture it. Toughness is proportional to the area under the load-elongation curve from the origin to the breaking point.
The ability of a material to withstand shock. See also brittleness, ductility, elasticity, fatigue, hardness, malleability
Ability of a material to absorb, energy and deform plastically before fracturing. Toughness is proportional to the area under the stress-strain curve from the origin to the breaking point. In metals, toughness is usually measured by the energy absorbed in a notch impact test.
Keywords:  impressive, difficulty
impressive difficulty
Keywords:  big, strong, property
the property of being big and strong
Keywords:  quality
The quality or state of being tough.