1. in a dark, dim, or shadowy manner; with little light
2. in a sad, depressed, or pessimistic manner; without hope or cheerfulness

Examples

• The old mansion loomed gloomily against the evening sky.
• She stared gloomily out the window at the rain.
• He spoke gloomily about the company's future prospects.
• The forecast predicted gloomily that sales would decline.
• The room was lit gloomily by a single candle.
• They sat gloomily in silence after hearing the bad news.