Define rigidity.

Rigidity refers to the state or quality of being rigid, which is characterized by stiffness, inflexibility, or lack of flexibility. It is the inability to bend, move, or change easily. In a physical sense, rigidity describes an object or material that is resistant to deformation under applied forces. For example, a rigid metal rod cannot be easily bent or twisted.

In a metaphorical or figurative sense, rigidity can refer to a person's mental or behavioral inflexibility. It implies a strict adherence to rules, routines, or beliefs without being open to alternative perspectives or adaptations. Rigidity in this context suggests an unwillingness to change one's opinions, attitudes, or behaviors, even in the face of new information or differing circumstances. It can also pertain to a lack of adaptability in organizational or bureaucratic structures, where rigid protocols or hierarchical systems hinder innovation or responsiveness to change.