low-level vs unprolonged

low-level

adj
  • not intense 

  • of, or relating to a program, or to code in which each statement corresponds to a single machine instruction 

  • detailed 

  • Situated or occurring at a lower level. 

  • relatively unimportant 

unprolonged

adj
  • Not prolonged. 

How often have the words low-level and unprolonged occurred in a corpus of books? (source: Google Ngram Viewer )