Read the dictionary definition of untouchable. All definitions for this word.
1. belongs to lowest social and ritual class in India
2. not capable of being obtained
1. a rare work, today almost inaccessible
2. timber is virtually unobtainable in the islands
3. untouchable resources buried deep within the earth
3. (especially used in traditional Hindu belief of the lowest caste or castes) defiling
4. forbidden to the touch
1. in most museums such articles are untouchable
5. impossible to assail
6. beyond the reach of criticism or attack or impeachment
1. for the first time criticism was directed at a hitherto untouchable target
