Crossword Genius

Lacking energy or enthusiasm (8)

Ross

I believe the answer is:

listless

(Other definitions for listless that I've seen before include "Tells sis to be lacking in energy" , "'Lethargic, spiritless (8)'" , "Lacking energy or interest" , "Short of energy (and ill-equipped for shopping?)" , "Devoid of energy or interest" .)

I've seen this clue in the Sydney Morning Herald.
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