untouchable

Adjective

• not capable of being obtained
  • a rare work, today almost inaccessible
    
  • timber is virtually unobtainable in the islands
    
  • untouchable resources buried deep within the earth
    

• ( especially used in traditional Hindu belief of the lowest caste or castes) defiling

• forbidden to the touch
  • in most museums such articles are untouchable
    

• impossible to assail

• beyond the reach of criticism or attack or impeachment
  • for the first time criticism was directed at a hitherto untouchable target- Newsweek
    

Noun

• belongs to lowest social and ritual class in India

Related words

• Synonyms: 
  inaccessible , unobtainable , unprocurable , unassailable , Harijan