Insensitive
Part of speech: adjective
Definition: not having normal physical feeling not having normal emotional feelings, cold, tactless, undiplomatic
Example sentence: When you see in places like Africa and parts of Asia abject poverty, hungry children and malnutrition around you, and you look at yourself as being people who have well being and comforts, I think it takes a very insensitive, tough person not to feel they need to do something.
Insusceptible
Part of speech: adjective
Definition: Impossible or difficult to effect; not susceptible.