unchallenged

/ˌʌnˈtʃælɪndʒd/
adjective
  1. Not questioned, disputed, or opposed; accepted without argument.
    • His authority in the classroom went unchallenged for years.
    • The statement was allowed to stand unchallenged during the debate.
    • She made a claim that remained unchallenged by the experts.
  2. Not competed against; having no rival or opponent.
    • The incumbent ran for re-election unchallenged.
    • The champion sat unchallenged on the throne for a decade.
    • He won the race unchallenged because his only opponent withdrew.
Antonyms
What does "unchallenged" mean? | whatsthatwordmean | whatsthatwordmean