Untouchable

noun

ən'təʧəbəl

Adjective

not capable of being obtained
“untouchable resources buried deep within the earth”
Similar:InaccessibleUnobtainableUnprocurable
beyond the reach of criticism or attack or impeachment
“for the first time criticism was directed at a hitherto untouchable target”
forbidden to the touch
“in most museums such articles are untouchable”
impossible to assail
Similar:Unassailable
(especially used in traditional Hindu belief of the lowest caste or castes) defiling

belongs to lowest social and ritual class in India
Similar:Harijan
Type of:IshmaelOutcastPariah