unchallengeably


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un·chal·lenge·a·ble

 (ŭn-chăl′ən-jə-bəl)
adj.
Not open to challenge: unchallengeable facts.

un·chal′lenge·a·bly adv.

unchallengeably

(ʌnˈtʃælɪndʒəblɪ)
adv
in a way that cannot be challenged; in an unchallengeable manner
References in periodicals archive ?
This is so because the time 'long ago' when things came into being is both indefinite and 'still part of the present' and has 'an unchallengeably sacred authority' (1979:24)--hence its sense being translatable as 'The Law'.
United Europe; a wider Holy Roman Empire; a New Order without the Nazis; a federation of European nations with a place for England, France, Spain, Wales, Brittany, Lithuania, Flanders, the Grand Duchy of Muscovy and all the rest; a forest of ancient flags on a green ground; an empire of extreme diversity, prosperous but aware that prosperity is not all; peaceable but unchallengeably strong in its own defence; a Europe taking its place once more as the natural centre and summit of the world.
28) He had prestige which was close to being unchallengeably high.