contemplation vs vacuity

contemplation

noun
  • The act of contemplating; musing; being highly concentrated in thought 

  • The act of looking forward to a future event 

  • Holy meditation. 

  • The state of being considered or planned. 

vacuity

noun
  • An empty or inane remark or thing. 

  • Idleness; listlessness. 

  • Emptiness. 

  • Physical emptiness, an absence of matter; vacuum. 

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