noun (n)

• the physical property of being stiff and resisting bending(noun.attribute)

  Synonym:
  rigidity
  

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

  Synonym:
  inflexibility, rigidity
  Antonym:
  flexibility, flexibleness
  

  source: wordnet30
• The quality or state of being rigid.(noun)

  source: webster1913