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1. Difficult or impossible to impeach: an unimpeachable witness.
2. Beyond reproach; blameless: unimpeachable behavior.
3. Beyond doubt; unquestionable: "works of such unimpeachable greatness" (Musical Heritage Review).

un′im·peach′a·bly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Adv.1.unimpeachably - without question; "Fred Winter is unquestionably the jockey to follow"; "they hired unimpeachably first-rate faculty members"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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Here was a family where prayers came at the same hour, where the Sabbath literature was unimpeachably selected, where the guest who should have leaned to any false opinion was instantly set down, and over which there reigned all week, and grew denser on Sundays, a silence that was agreeable to his ear, and a gloom that he found comfortable.
Marriage, like religion and erudition, nay, like authorship itself, was fated to become an outward requirement, and Edward Casaubon was bent on fulfilling unimpeachably all requirements.
It will be hard to determine if it is exposure to nature that makes these people the characters they are selfless, sensitive, unimpeachably honest, upright and humane or if they are naturally of this bent that leads them to engage in mountaineering, the most extreme among extreme sports and, indeed, the most sublime of them all.
NEWThe vision and intentions of the program are unimpeachably present but what's lacking is a more sound and less risky financial packaging.
The media should be tough but fair -- completely, unimpeachably, ferociously fair.
(90) The rules about conflicts are not, strictly speaking, duties to avoid situations; they are rules that say that fiduciary powers cannot be unimpeachably exercised in certain situations, because a power exercised in a conflict situation is voidable.
It's telling that both his children followed unimpeachably safe paths in life, nothing to do with clubs and casinos.
But by scraping away at layers of corporate misdirection, by asking and asking again and not letting go, Simpson reached something naked and ugly and unimpeachably true.
They further declared the moral authority of the UNP to govern null and void after the bond scam was unimpeachably linked to the party, and also after the president subtly hinted that members of Wickremesinghe's cabinet were neck deep in underhanded trading practices that were damaging the country's reputation as an exporter of high quality tea.
It is in this statutory model of religious exemptions that non-religious beliefs best share in exemptions: the method does not rely on the text of the Constitution, which explicitly and unimpeachably singles out religion, (195) and it only covers those situations in which the legislature has already found room for accommodation from a regulatory scheme.
Thus, it is vitally important that all stakeholders view as unimpeachably objective any independent government body that is charged with investigating and analyzing the root causes of significant petrochemical accidents and making recommendations for future prevention to not only regulators, but also to industry, unions, state, and local governments.
That I make so much out of so little is not to say that Darl's ruminations are unimpeachably "private," nor solely "internal" in derivation.