un ‧ chal ‧ lenged /ʌnˈtʃæləndʒd, ʌnˈtʃælɪndʒd/ BrE AmE adjective
[ Word Family: adjective : ↑ challenging , ↑ challenged ≠ ↑ unchallenged , ↑ unchallengeable ; noun : ↑ challenge , ↑ challenger ; verb : ↑ challenge ; adverb : ↑ challengingly ]
1 . accepted and believed by everyone and not doubted:
She couldn’t let a statement like that go unchallenged.
2 . someone who goes somewhere unchallenged is not stopped and asked who they are or what they are doing