incompletion vs uncompletedness

incompletion

noun
  • The state or quality of not being complete. 

  • A forward pass which is not caught inbounds by the intended receiver. 

  • Something which is not completed. 

uncompletedness

noun
  • The state or condition of being uncompleted 

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