Rigidity refers to the quality of being stiff and inflexible. In materials science, it describes how resistant a material is to deformation when force is applied. For example, metals like steel exhibit high rigidity, making them suitable for construction and manufacturing. In psychology, rigidity can describe a person's inability to adapt to new situations or ideas. This can manifest as stubbornness or an unwillingness to change one's beliefs or behaviors. Such rigidity can hinder personal growth and relationships, as individuals may struggle to accept differing perspectives or adjust to new circumstances.