inhuman vs unhuman

inhuman

adj
  • Transcending or different than what is human. 

  • Of or pertaining to inhumanity and the indifferently cruel, sadistic or barbaric behavior it brings. 

unhuman

adj
  • Not resembling or having the qualities of a human being. 

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