concluding vs vacuity

concluding

adj
  • Finishing; closing; final. 

noun
  • A conclusion. 

vacuity

noun
  • Idleness; listlessness. 

  • Emptiness. 

  • Physical emptiness, an absence of matter; vacuum. 

  • An empty or inane remark or thing. 

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