continuative vs unvarying

continuative

adj
  • Of or pertaining to continuation. 

  • durative. 

noun
  • a durative. 

  • Something that causes a continuation. 

unvarying

adj
  • persistent, constant, changeless 

  • lacking variety; having a uniform character 

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