1. in a heavy, slow, or sluggish manner
2. in a dull, lifeless, or spiritless way

Examples

• She walked leadenly down the hallway after hearing the bad news.
• The sky hung leadenly overhead, threatening rain.
• His feet moved leadenly as exhaustion set in.
• The actor delivered his lines leadenly, without emotion.
• Time passed leadenly during the boring lecture.
• The heavy door swung leadenly on its hinges.