1. the quality or state of being dark, dim, or poorly lit
2. the quality or state of being sad, depressed, or melancholy
3. a feeling of hopelessness or pessimism about the future

Examples

• The gloominess of the winter days made her feel tired and unmotivated.
• He stared out the window at the gloominess of the overcast sky.
• The gloominess in her voice suggested she was deeply troubled.
• Despite the gloominess of the economic forecast, some investors remained hopeful.
• The old mansion had an air of gloominess that made visitors uncomfortable.
• She tried to shake off the gloominess that had settled over her mood.
• The gloominess of the basement made it an unsuitable place for storage.
• His constant gloominess about the project's chances frustrated the team.