inferiority complex vs sheepishness

inferiority complex

noun
  • A sense of inferiority; the feeling that one is inferior to others in certain aspects. 

sheepishness

noun
  • The quality or property of being sheepish; shyness; bashfulness. 

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