pretension vs unpretentiousness

pretension

verb
  • To apply tension to reinforcing strands before concrete is poured in. 

  • To apply tension to an object before some other event or process. 

noun
  • A claim or aspiration to a particular status or quality. 

  • Pretentiousness. 

unpretentiousness

noun
  • The state or condition of being unpretentious. 

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