monotonic vs sterile

monotonic

adj
  • Uttered in a monotone; monotonous. 

  • said of a function that either never decreases or never increases as its independent variable increases. 

  • of or using the Greek system of diacritics which discards the breathings and employs a single accent to indicate stress. It replaced polytonic system in 1982. 

sterile

adj
  • Fruitless, uninspiring, or unproductive. 

  • Terse; lacking sentiment or emotional stimulation, as in a manner of speaking. 

  • Unable to reproduce (or procreate). 

  • Of weapons: foreign-made and untraceable to the United States. 

  • Germless; free from all living or viable microorganisms. 

  • Free from dangerous objects, as a zone in an airport that can be only be entered via a security checkpoint. 

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