bush league vs unable

bush league

adj
  • Of inferior quality. 

  • Amateurish, unprofessional, unpolished, juvenile. 

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

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

unable

adj
  • Not able; lacking a certain ability. 

intj
  • Indicating that a requested course of action is not possible to carry out. 

verb
  • To render unable; to disable. 

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