/ ʌnˈtʃælɪndʒd; NAmE / adjective
1.
not doubted; accepted without question; not challenged :
She could not allow such a claim to go unchallenged .
2.
( of a ruler or leader, or their position ) not opposed by anyone :
He is in a position of unchallenged authority.
3.
without being stopped and asked to explain who you are, what you are doing, etc. :
I walked into the building unchallenged.