bush league vs mediocrity

bush league

noun
  • A low-ranking or inferior level among groups, professions, organizations, etc. 

  • A professional sports association at the lower levels of minor league organization. 

adj
  • Of inferior quality. 

  • Amateurish, unprofessional, unpolished, juvenile. 

mediocrity

noun
  • The condition of being mediocre; having only an average degree of quality, skills etc.; no better than standard. 

  • An individual with mediocre abilities or achievements. 

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