Definitions

1. adjective

lacking energy, enthusiasm, or interest; apathetic

“After a long illness, she became lethargic and lost interest in her hobbies.”

2. adjective

causing or characterized by a lack of energy; sluggish

“The lethargic pace of the movie made it difficult to stay awake.”

3. noun

a state of being lethargic; apathy or lack of energy

“Her lethargy was a result of the medication she was taking.”

4. noun

a type of sleep or torpor in animals, especially in hibernating animals

“The bears entered a state of lethargy during the winter months.”