Origin: Latin suffix -able
Untouchable has 8 different meanings across 2 categories:
belongs to lowest social and ritual class in India
A criminal who is so adept that they cannot be arrested or convicted.
beyond the reach of criticism or attack or impeachment
"for the first time criticism was directed at a hitherto untouchable target"
impossible to assail
(especially used in traditional Hindu belief of the lowest caste or castes) defiling
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"
Not able to be touched.