blundering vs bush league

blundering

noun
  • The act of making a blunder. 

bush league

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

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

adj
  • Of inferior quality. 

  • Amateurish, unprofessional, unpolished, juvenile. 

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