superhuman vs unaccountable

superhuman

adj
  • Beyond what is possible for a human being. 

noun
  • A human being with remarkable abilities or superpowers. 

unaccountable

adj
  • inexplicable; unable to account for, or explain. 

  • not responsible; free from accountability or control. 

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