an unquestionable (or unequivocal) loss of prestige.
Examples of unquestionable
unquestionable
Of course, the general's unquestionable expertise had no bearing on the outcome.
From the infowars.com
That Android model also comes with a real, unquestionable fragmentation problem.
From the techcrunch.com
However, his batting ability, particularly defensively, remained unquestionable.
From the en.wikipedia.org
His rich, unquestionable, total and continuous forgiveness is transformational.
From the washingtontimes.com
They all offer their own unquestionable view of reality and condemn all others.
From the economist.com
The presence of these groups, formed into a loose network, is now unquestionable.
From the guardian.co.uk
The importance of the cult of Aphrodite is unquestionable, along with its wealth.
From the en.wikipedia.org
How can unsubstantiated claims become so powerful, so seemingly unquestionable?
From the guardian.co.uk
The smoother-looking machine's abilities mean it is an unquestionable success.
From the cars.uk.msn.com
More examples
Incapable of being questioned; "unquestionable authority"
Authentic: not counterfeit or copied; "an authentic signature"; "a bona fide manuscript"; "an unquestionable antique"; "photographs taken in a veritable bull ring"
(unquestionableness) indisputability: the quality of being beyond question or dispute or doubt
(unquestionably) without question; "Fred Winter is unquestionably the jockey to follow"; "they hired unimpeachably first-rate faculty members"