indeclinability vs inelegance

indeclinability

noun
  • The quality of being indeclinable. 

inelegance

noun
  • The state or quality of being inelegant; lack of grace, refinement, beauty, or polish in language, composition, or manners. 

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