Slug·gish a.
  1. Habitually idle and lazy; slothful; dull; inactive; as, a sluggish man.
  2. Slow; having little motion; as, a sluggish stream.
  3. Having no power to move one's self or itself; inert.
     Matter, being impotent, sluggish, and inactive, hath no power to stir or move itself.   --Woodward.
     And the sluggish land slumbers in utter neglect.   --Longfellow.
  4. Characteristic of a sluggard; dull; stupid; tame; simple. [R.] “So sluggish a conceit.”
  Syn: -- Inert; idle; lazy; slothful; indolent; dronish; slow; dull; drowsy; inactive. See Inert.
  -- Slug*gish*ly, adv. -- Slug*gish*ness, n.
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  sluggishly
       adv : in a sluggish manner; "the smoke rose sluggishly"