self-importance vs unpretentiousness

self-importance

noun
  • An exaggerated estimate of one's own importance or merit, especially as manifested by the conduct or manners; self-conceit. 

unpretentiousness

noun
  • The state or condition of being unpretentious. 

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