flexible vs rocky

flexible

adj
  • Capable of being flexed or bent without breaking; able to be turned or twisted without breaking. 

  • Capable or being adapted or molded in some way. 

  • Willing or prone to give way to the influence of others; not invincibly rigid or obstinate. 

noun
  • Something that is flexible. 

rocky

adj
  • Like a rock; rigid, solid. 

  • In the style of rock music. 

  • Abounding in, or full of, rocks; consisting of rocks. 

  • Having a habitat around or on rocks. 

  • Easily rocked; unstable. 

  • Encountering many problems; difficult, troubled; also, in danger or distress. 

  • Of a person: ill, or unsteady (for example, as a result of a shock). 

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