gravity vs seriousness

gravity

noun
  • The state or condition of being grave; seriousness. 

  • The lowness of a note. 

  • Specific gravity. 

  • The state or condition of having weight; weight; heaviness. 

  • Gravitation, the universal force exercised by two bodies onto each other. 

  • The force at the Earth's surface, of the attraction by the Earth's masses, and the centrifugal pseudo-force caused by the Earth's rotation, resulting from gravitation. 

seriousness

noun
  • The state or quality of being serious. 

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