1. Slow and apathetic
   "a sluggish worker";
   - inert, torpid, dozy [Brit, informal]
    
2. Slow or slothful
   "a sluggish stream";
   - sulky
    
3. (of business) not active or brisk
   "business is sluggish"; "a sluggish market";
   - dull, slow

See also: inactive, slow