repression vs shyness

repression

noun
  • The involuntary rejection from consciousness of painful or disagreeable ideas, memories, feelings, or impulses. 

  • The act of repressing; state of being repressed. 

shyness

noun
  • The quality of being shy; a fear of social interactions. 

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