efficient vs not have it

efficient

adj
  • expressing the proportion of consumed energy that was successfully used in a process; the ratio of useful output to total input 

  • causing effects, producing results; bringing into being; initiating change (rare except in philosophical and legal expression efficient cause = causative factor or agent) 

  • making good, thorough, or careful use of resources; not consuming extra. Especially, making good use of time or energy 

  • effective, efficacious 

not have it

How often have the words efficient and not have it occurred in a corpus of books? (source: Google Ngram Viewer )