Etymology
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untouchable (adj.)

1560s, "immaterial," from un- (1) "not" + touchable (see touch (v.)). Meaning "that legally cannot be interfered with" is recorded from 1734. Meaning "too loathsome or defiling to be touched" is recorded from 1873. The noun, in reference to a hereditary low caste of India, is attested from 1909; the term and the restrictions were made illegal in India in 1947.

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Definitions of untouchable
1
untouchable (adj.)
(especially used in traditional Hindu belief of the lowest caste or castes) defiling;
untouchable (adj.)
beyond the reach of criticism or attack or impeachment; "for the first time criticism was directed at a hitherto untouchable target"- Newsweek;
untouchable (adj.)
impossible to assail;
Synonyms: unassailable
untouchable (adj.)
forbidden to the touch;
in most museums such articles are untouchable
untouchable (adj.)
not capable of being obtained;
untouchable resources buried deep within the earth
Synonyms: inaccessible / unobtainable / unprocurable
2
untouchable (n.)
belongs to lowest social and ritual class in India;
Synonyms: Harijan
From wordnet.princeton.edu