untouchable
adjective
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not capable of being obtainedinaccessible
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( especially used in traditional Hindu belief of the lowest caste or castes) defiling
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forbidden to the touch“in most museums such articles are untouchable”
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impossible to assailunassailable
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beyond the reach of criticism or attack or impeachment“for the first time criticism was directed at a hitherto untouchable target- Newsweek”
noun
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belongs to lowest social and ritual class in India