1. in a way that lacks energy, enthusiasm, or vitality
2. in a way that resembles something dead or inanimate

Examples

• She stared lifelessly out the window during the long meeting.
• The actor delivered his lines lifelessly, boring the audience.
• His arms hung lifelessly at his sides after the exhausting workout.
• The flowers drooped lifelessly in the vase without water.
• The team played lifelessly in the final quarter, lacking any motivation.
• Her hair fell lifelessly around her shoulders in the humid weather.