unchallenged
adjective
un·chal·lenged
ˌən-ˈcha-lənjd
: not questioned, disputed, or opposed : not challenged
an unchallenged assumption
unchallenged authority
… modes of thinking that have gone unchallenged since the time of Newton, Descartes, and even Aristotle.—James Bailey
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Merriam-Webster unabridged
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