Stiffness

Stiffness is the extent to which an object resists deformation in response to an applied force.[1]

For pain and/or loss of range of motion of a joint, see joint stiffness. For the term regarding the stability of a differential equation, see stiff equation.
Extension of a coil spring, caused by an axial force,

The complementary concept is flexibility or pliability: the more flexible an object is, the less stiff it is.[2]

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