foible vs trait

foible

noun
  • A quirk, idiosyncrasy, or mannerism; an unusual habit that is slightly strange or silly. 

  • A weakness or failing of character. 

  • Part of a sword between the middle and the point, weaker than the forte. 

trait

noun
  • An identifying characteristic, habit or trend. 

  • An uninstantiable collection of methods that provides functionality to a class by using the class’s own interface. 

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