What means the same as Rigid?

Words that mean same as rigid include stiff, inflexible, unbending, unyielding, firm, hard, solid, inelastic, and taut when describing physical stiffness. For example, rigid board means stiff board that does not bend easily. For behavior or rules, synonyms include strict, inflexible, uncompromising, stern, rigorous, stringent, unadaptable, and obstinate, as in rigid rules meaning strict rules that cannot be changed. For personality, synonyms include inflexible, stubborn, unyielding, and set in ways. In construction, rigid means same as solid or fixed. In anatomy, rigid can mean stiff or tense. So synonyms vary by context, but core idea of rigid is not flexible, not bending, not easily changed. Common synonyms are stiff for physical objects, inflexible for both physical and figurative, strict for rules, and firm for materials. Antonyms are flexible, pliable, adaptable, and lenient, so rigid implies resistance to bending or changing.