Listless (adjective)

1. Showing a lack of interest or energy; languid.
2. Lacking in spirit or enthusiasm.

Origin:

Mid 16th century: from obsolete list "desire, pleasure" + -less.

Examples:

1. He felt listless and tired after the long flight.
2. She was listless and unresponsive to the treatment.
3. The patient is listless and has no appetite.
4. The economy was in a listless state.
5. The listless children were reluctant to go outside to play.