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Adjective: sluggish  slú-gish
  1. Moving slowly
    "a sluggish stream";
    - sulky
  2. (of business) not active or brisk
    "business is sluggish"; "a sluggish market";
    - dull, slow
  3. Slow and apathetic
    "a sluggish worker";
    - inert, soggy, torpid

See also: inactive, slow