In physics:
* Stiffness: The resistance of a material to deformation under stress. A rigid material will resist bending, stretching, or compression.
* Inflexibility: The inability to change or adapt. A rigid body is one that does not deform under the influence of forces.
In psychology:
* Inflexibility: The inability to change one's behavior, thoughts, or beliefs in response to new information or situations.
* Lack of spontaneity: A rigid person might be overly controlled and have difficulty expressing emotions or adapting to change.
In general:
* Unbending: Refusing to change or compromise. A rigid person might be stubborn, inflexible, and unwilling to consider other perspectives.
* Strict: Following rules and procedures strictly, sometimes to the point of being unreasonable.
* Formal: Lacking warmth or flexibility in behavior or expression.
Examples:
* "The bridge was built with rigid steel beams." (Physics - stiffness)
* "The company's rigid policies discouraged innovation." (General - inflexible, strict)
* "He had a rigid personality and refused to listen to anyone else's ideas." (Psychology - inflexibility)
The specific meaning of "rigidity" will be clearer based on the context in which it is used.