untouchable

Belongs to lowest social and ritual class in India.

Impossible to assail.

Not capable of being obtained.

“untouchable resources buried deep within the earth”

Beyond the reach of criticism or attack or impeachment.

“for the first time criticism was directed at a hitherto untouchable target”

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

Forbidden to the touch.

“in most museums such articles are untouchable”