inert in WordNet English dictionary

1. having only a limited ability to react chemically; chemically inactive
   "inert matter"; "an indifferent chemical in a reaction"
   inert  indifferent  neutral 
   
2. slow and apathetic
   "she was fat and inert"; "a sluggish worker"; "a mind grown torpid in old age"
   inert  sluggish  soggy  torpid 
   
3. unable to move or resist motion
   inert