null and void vs unreal

null and void

adj
  • invalid, cancelled, unenforceable 

unreal

adj
  • very impressive; amazing; unbelievable; incredible; larger or more fantastic than typical of real life. 

  • Not real or substantial; having no actual presence in reality; lacking the characteristics of reality. 

How often have the words null and void and unreal occurred in a corpus of books? (source: Google Ngram Viewer )