discouraging vs impending

discouraging

noun

  • discouragement 

adj

  • that causes discouragement 

impending

noun

  • Something that impends or threatens; an expected event. 

adj

  • Approaching; drawing near; about to happen or expected to happen. 

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