The word glummer often describes a feeling of sadness or a general sense of gloominess. Alternative synonyms you can use include downcast, despondent, melancholic, gloomy or disheartened. Using words like desolate, dismal, bleak or forlorn can also add more emphasis to the feeling of despair. Other words to describe someone feeling glummer could include blue, low or somber. Additionally, restless, anxious, or irritable are all words that can be used to describe a heightened state of emotional tension, or a sense of unease that can accompany feelings of gloom. Whatever word you choose, make sure it is an accurate reflection of the mood and tone you are trying to convey.