<p><strong>Adjective</strong></p><ul><li>stiff or unyielding; not pliant or flexible; hard: a rigid strip of metal.</li><li>firmly fixed or set.</li><li>inflexible, strict, or severe: a rigid disciplinarian; rigid rules of social behavior.</li><li>exacting; thorough; rigorous: a rigid examination.</li><li>Mechanics: of, relating to, or noting a body in which the distance between any pair of points remains fixed under all forces; having infinite values for its shear modulus, bulk modulus, and Young's modulus.</li><li>Aeronautics: (of an airship or dirigible) having a form maintained by a stiff, unyielding structure contained within the envelope.</li></ul><p><strong>End of Response</strong></p>