artlessness vs unsophistication

artlessness

noun
  • the state or quality of being artless 

  • the state or quality of being innocent; naïveté 

unsophistication

noun
  • Absence of sophistication; the quality of being unsophisticated. 

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