Sluggish; dormant (8)
I believe the answer is:
inactive
I believe this is a double definition.
'sluggish' is the first definition.
(similar in meaning)
'dormant' is the second definition.
(I know that dormant can be written as inactive)
(Other definitions for inactive that I've seen before include "Chemically inert" , "Resting" , "Dormant" , "Unoccupied" , "Idle, showing no movement" .)