1) Inflexibility 2) Rigidity 3) Rigidness 1) Inflexibility 
• (n.) The quality or state of being inflexible; inflexibility; rigidity; firmness.
In·flex'i·ble·ness noun The quality or state of being inflexible; inflexibility; rigidity; firmness. 
inflexible, inflexibility, inflexibleness 1. Incapable of adapting or changing to meet circumstances: 'An inflexible law.' 2. Adhering firmly to a viewpoint or principle. 3. Firmly established and impossible to change: 'An inflexible rule.' 4. Rigid; stiff and bendable only with difficulty. 5. Incapable of being changed; unalterable. 6. Unyiel...
noun a lack of physical flexibility