apprehensiveness vs foreboding

apprehensiveness

noun
  • the state of being apprehensive 

foreboding

noun
  • An evil omen. 

  • A sense of evil to come. 

adj
  • Of ominous significance; serving as an ill omen; foretelling of harm or difficulty. 

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