I. ˌən-ˈtə-chə-bəl adjective
Date: 1607
1.
a. : forbidden to the touch : not to be handled
b. : exempt from criticism or control
2. : lying beyond reach
3. : disagreeable or defiling to the touch
II. noun
Date: 1909
: one that is untouchable ; specifically : a member of a large formerly segregated hereditary group in India having in traditional Hindu belief the quality of defiling by contact a member of a higher caste