English to English

adjective (a)

• not responsive to physical stimuli(adj.all)

  Example:
  Insensitive to radiation.
  

  Antonym:
  sensitive
  

  source: wordnet30
• deficient in human sensibility; not mentally or morally sensitive(adj.all)

  Example:
  Insensitive to the needs of the patients.
  

  source: wordnet30
• Not sensitive; wanting sensation, or wanting acute sensibility.(adjective)

  source: webster1913