sluggish in WordNet English dictionary

1. (of business) not active or brisk
   "business is dull (or slow)"; "a sluggish market"
   dull  slow  sluggish 
   
2. slow and apathetic
   "she was fat and inert"; "a sluggish worker"; "a mind grown torpid in old age"
   inert  sluggish  soggy  torpid 
   
3. moving slowly
   "a sluggish stream"
   sluggish  sulky