blues vs ennui

blues

noun
  • A feeling of sadness or depression. 

  • Any of various blue pills sold on the street, mimicking the appearance of prescription pain killer tablets but often laced with fentanyl that leads to overdose deaths (see opioid epidemic). 

  • One's particular life experience, particularly including the hardships one has faced. 

  • New South Wales. 

  • Manchester City FC. 

  • A musical form, African-American in origin, generally featuring an eight-bar or twelve-bar blues structure and using the blues scale. 

  • Carlton Football Club. 

  • A musical composition following blues forms. 

  • Everton FC. 

  • The negative emotional state produced by a particular action, occupation, experience or idea. 

  • A uniform made principally of a blue fabric, and especially a full dress uniform thus colored. 

  • Chelsea FC. 

  • Birmingham City FC. 

ennui

noun
  • A gripping listlessness or melancholia caused by boredom; depression. 

verb
  • To make bored or listless; to weary. 

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