insensible in WordNet English dictionary

1. barely able to be perceived
   "the transition was almost indiscernible"; "an almost insensible change"
   indiscernible  insensible  undetectable 
   
2. incapable of physical sensation
   "insensible to pain"; "insensible earth"
   insensible 
   
3. unresponsive to stimulation
   "he lay insensible where he had fallen"; "drugged and senseless"
   insensible  senseless 
   
4. unaware of or indifferent to
   "insensible to the suffering around him"
   insensible  unaffected