demeanor vs mannerism

demeanor

noun
  • The social, non-verbal behaviours (such as body language and facial expressions) that are characteristic of a person. 

mannerism

noun
  • A noticeable personal habit, a verbal or other (often, but not necessarily unconscious) habitual behavior peculiar to an individual. 

  • In fine art, a style that is inspired by previous models, aiming to reproduce subjects in an expressive language. 

  • Exaggerated or affected style in art, speech, or other behavior. 

  • In literature, an ostentatious and unnatural style of the second half of the sixteenth century. In the contemporary criticism, described as a negation of the classicist equilibrium, pre-Baroque, and deforming expressiveness. 

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