built-up vs undeveloped

built-up

adj
  • Made of sections or layers, one on top of the other. 

  • Having buildings, especially having residences and high population density. 

  • Constructed or enhanced. 

  • (of an area of land) Having street lights and therefore subject to a 30 mph speed limit. 

  • Having increased in size, quantity, or intensity over time; accumulated. 

  • (of an area of land) Having specific traffic signaling and therefore usually subject to a maximum 50 km/h speed limit. 

undeveloped

adj
  • not developed or used 

  • not built on, unbuilt; not ready for building on 

  • lagging behind others, especially in economic or social matters 

How often have the words built-up and undeveloped occurred in a corpus of books? (source: Google Ngram Viewer )