untouchable

From un- +‎ touchable.

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untouchable (comparative more untouchable, superlative most untouchable)

1. Not able to be touched.
   • 2023 May 14, Rebecca Ratcliffe, Thitipol Panyalimpanun, “Opposition parties take lead in Thai election”, in The Guardian‎:

     Sunday’s election is the first to be held after youth-led mass protests in 2020 shocked the establishment by […] criticising an institution previously considered untouchable.

2. Not able to be defeated or bested.

   The Minnesota Vikings have been untouchable this year as they've won their sixth consecutive game.

untouchable (plural untouchables)

1. A criminal who is so well-connected that they cannot be harmed.
2. Synonym of outcast: a person excluded from society.
3. (India) A member of the lowest and most despised caste in traditional Indian society.
4. A law enforcement agent immune to intimidation, bribery, or seduction.

• (member of the lowest Indian caste): Dalit, pariah, undesirable (noun)