What does the word glum mean?

Usage examples for glum

  1. Just now he wore an expression of countenance that was somewhat glum as he watched the lingering afterglow which edged the western crests of the " Kaintuck' Ridges" with pale amber. – The Tempering by Charles Neville Buck
  2. I really didn't think of it again until I saw you looking so black and glum." – The Deluge by David Graham Phillips
  3. And here's Mrs. Lafirme looking almost as glum. – At Fault by Kate Chopin
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