Sluggish, listless (9)
I believe the answer is:
lethargic
I believe this is a double definition.
'sluggish' is the first definition.
(synonyms)
'listless' is the second definition.
(similar in meaning)
(Other definitions for lethargic that I've seen before include "Lackadaisical" , "reluctant to move" , "lack of energy" , "Sluggish and apathetic" , "The garlic (anag.)" .)