What is the meaning of Gloom?

Darkness, dimness, or obscurity.

A depressing, despondent, or melancholic atmosphere.

Cloudiness or heaviness of mind; melancholy; aspect of sorrow; low spirits; dullness.

A drying oven used in gunpowder manufacture.

To be dark or gloomy.

To look or feel sad, sullen or despondent.

To render gloomy or dark; to obscure; to darken.

To fill with gloom; to make sad, dismal, or sullen.

To shine or appear obscurely or imperfectly; to glimmer.

Source: wiktionary.org