1. in a dark manner; without light or with little light
2. in a threatening, mysterious, or ominous way
3. in a pessimistic or gloomy manner

Examples

• The room was darkly lit by a single candle.
• He spoke darkly of troubles ahead.
• She smiled darkly at his naive comment.
• The forest path stretched darkly before them.
• The politician darkly hinted at corruption in the government.
• Storm clouds gathered darkly overhead.
• He viewed the future darkly after losing his job.