built-up vs unmarked

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. 

unmarked

adj
  • Not marked; not standing out as unusual. 

  • Not bearing identification. 

  • Not noticed. 

  • Free from blemishes. 

  • Not marked, not closely followed by a defensive player. 

  • Not having been marked, or assigned a score. 

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