untouchable

not capable of being obtained

a rare work, today almost inaccessible

timber is virtually unobtainable in the islands

( 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

belongs to lowest social and ritual class in India