untouchable
noun
Definitions
A criminal who is so adept that they cannot be arrested or convicted.
A pariah.
In the Indian caste system, a member of the lowest caste.
An incorruptible law enforcement agent.
adjective
Definitions
Not able to be touched.
Not able to be defeated or bested.
Example: The Minnesota Vikings have been untouchable this year as they've won their sixth consecutive game.