bush league vs callow

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. 

callow

adj
  • Shallow or weak-willed. 

  • Newly emerged or hatched, juvenile. 

  • Immature, lacking in life experience. 

  • Lacking color or firmness (of some kinds of insects or other arthropods, such as spiders, just after ecdysis); teneral. 

  • Unburnt. 

  • Unfledged (of a young bird), featherless. 

  • Of land: low-lying and liable to be submerged. 

  • Bald, hairless, bare. 

noun
  • A callow young bird. 

  • An alluvial flat. 

  • A callow or teneral phase of an insect or other arthropod, typically shortly after ecdysis, while the skin still is hardening, the colours have not yet become stable, and as a rule, before the animal is able to move effectively. 

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