slug·gish 
(slŭgĭsh)
(slŭgĭsh)adj.
1. Displaying little movement or activity; slow; inactive: a sluggish stream; sluggish growth.
2. Lacking alertness, vigor, or energy; inert or indolent.
3. Slow to perform or respond to stimulation.
[Middle English, probably from slugge, lazy person; see SLUG2.]
sluggish·ly adv.
sluggish·ness n.