privative vs vacuous

privative

adj
  • consisting in the absence of something; negative 

  • causing privation; depriving 

  • indicating the absence of something 

noun
  • something that causes privation or indicates an absence 

vacuous

adj
  • Empty; void; lacking meaningful content. 

  • Showing a lack of thought or intelligence; vacant. 

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