malleability vs rigidity

malleability

noun
  • The quality or state of being malleable. 

  • The property by virtue of which a material can be extended in all directions without rupture by the application of load; a material's ability to be bent, formed, or shaped without cracking or breaking. 

  • a property of a cryptographic algorithms in which an adversary can alter a ciphertext such that it decrypts to a related plaintext 

rigidity

noun
  • Stiffness of appearance or manner; want of ease or elegance. 

  • stickiness (of prices/wages etc.). Describing the tendency of prices and money wages to adjust to changes in the economy with a certain delay. 

  • The quality or state of being rigid; lack of pliability; the quality of resisting change of physical shape 

  • The amount of resistance with which a body opposes change of form. 

How often have the words malleability and rigidity occurred in a corpus of books? (source: Google Ngram Viewer )