full-grown vs underdeveloped

full-grown

adj
  • Fully developed; adult 

underdeveloped

adj
  • immature and not fully developed 

  • having a low level of economic productivity and technological sophistication 

  • of a film that has had insufficient development before being fixed 

How often have the words full-grown and underdeveloped occurred in a corpus of books? (source: Google Ngram Viewer )