deadpan vs monotonic

deadpan

adj
  • Deliberately impassive or expressionless. 

  • Impassive. 

  • Having such a face or look. 

adv
  • In a deadpan manner. 

verb
  • To express (oneself) in an impassive or expressionless manner. 

noun
  • A style of comedic delivery in which something humorous is said or done while not exhibiting a change in emotion or facial expression. 

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. 

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