flexion vs flexuosity

flexion

noun
  • The state of being bent or flexed. 

  • Deviation from straightness. 

  • The act of bending a joint, especially a bone joint; the counteraction of extension. 

flexuosity

noun
  • Quality of being flexuous. 

  • A flexuous point; a sinuous curve. 

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