Here's a breakdown:
* Lacking energy: Feeling tired, drained, and unable to exert much effort.
* Enthusiasm: Showing little interest or excitement about things.
* Sluggish: Moving or reacting slowly.
* Apathetic: Showing or feeling no interest, enthusiasm, or concern.
Example:
* "After a long day at work, I felt too lethargic to go out."
* "The medication made him feel lethargic and drowsy."
Synonyms:
* Drowsy
* Tired
* Sluggish
* Listless
* Apathetic
* Unresponsive
Antonyms:
* Energetic
* Enthusiastic
* Lively
* Animated
* Alert