inconsistency vs unpredictability

inconsistency

noun
  • The state of being inconsistent. 

  • An incompatibility between two propositions that cannot both be true. 

unpredictability

noun
  • The quality of being unpredictable. 

  • Something which is unpredictable. 

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