boredom vs flatness

boredom

noun
  • An instance or period of being bored; A bored state. 

  • The state of being bored. 

flatness

noun
  • The state of being bland : dullness 

  • slim-tailedness or platykurticity 

  • Lack of bouquet and freshness of a wine, through too much aeration or infection with film yeasts 

  • The state of being flat 

  • The state of being two-dimensional; planar : planarity 

  • Mattness, the quality of a painted surface which scatters or absorbs the light falling on it, so as to be substantially free from gloss or sheen 

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