Glum/ɡlʌm/ Definition 1 of 2Pro Tip 1/3Negative Nuance Glum suggests a mild, quiet sort of sadness without causing a big fuss. Despite the party atmosphere, he sat in the corner with a glum expression. Pro Tip 2/3Non-Verbal Cues 'Glum' often implies a sad facial expression or body language. Her glum face made it obvious she didn't enjoy the movie. Pro Tip 3/3Brief Sadness Glum can be used for temporary feelings, not necessarily deep or chronic sadness. He felt glum after losing the game, but he cheered up later.