gloomy vs smouldering

gloomy

adj
  • Not very illuminated; dim because of darkness, especially when appearing depressing or frightening. 

  • Suffering from gloom; melancholy; dejected. 

noun
  • Someone or something that is gloomy or pessimistic. 

smouldering

adj
  • Burning slowly, producing smoke but no flame. 

noun
  • The act by which something smoulders; residual heat. 

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