noun (n)

• a lack of physical flexibility(noun.attribute)

  Synonym:
  inflexibleness
  

  source: wordnet30
• the quality of being rigid and rigorously severe(noun.attribute)

  Synonym:
  rigidity, rigidness
  Antonym:
  flexibility, flexibleness
  

  source: wordnet30
• The quality or state of being inflexible, or not capable of being bent or changed; unyielding stiffness; inflexibleness; rigidity; firmness of will or purpose; unbending pertinacity; steadfastness; resoluteness; unchangeableness; obstinacy.(noun)

  source: webster1913