complexity vs monotony

complexity

noun
  • That which is and renders complex; intricacy; complication. 

  • The state of being complex; intricacy; entanglement. 

monotony

noun
  • Tedium as a result of repetition or a lack of variety. 

  • The property of a monotonic function. 

  • The quality of having an unvarying tone or pitch. 

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