fervent vs smouldering

fervent

adj
  • Glowing, burning, very hot. 

  • Having or showing emotional warmth, fervor, or passion. 

  • Exhibiting particular enthusiasm, zeal, conviction, persistence, or belief. 

smouldering

adj
  • Burning slowly, producing smoke but no flame. 

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

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