downer vs melancholy

downer

noun
  • Something or someone disagreeable, dispiriting or depressing; a killjoy. 

  • A livestock animal that has collapsed. 

  • A negative drug trip. 

  • A form of industrial action in which workers down tools and refuse to work. 

  • A drug that has depressant qualities. 

melancholy

noun
  • Great sadness or depression, especially of a thoughtful or introspective nature. 

  • Black bile, formerly thought to be one of the four "cardinal humours" of animal bodies. 

adj
  • Affected with great sadness or depression. 

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