Crossword Genius

Lack of energy or vitality (8)

Ross

I believe the answer is:

lethargy

(Other definitions for lethargy that I've seen before include "Weariness" , "'Lassitude, langour (8)'" , "Extreme lack of energy, listlessness" , "Lack of energy and enthusiasm" , "Stringed instrument" .)

I've seen this clue in The Mirror.
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