The phrase "astounding evidence" is correct and usable in written English.
You can use it when referring to evidence that is surprising or impressive in its clarity or significance.
Example: "The researchers presented astounding evidence that challenged the long-held beliefs in the scientific community."
Alternatives: "remarkable evidence" or "extraordinary evidence".
Profitability and growth in this little-tapped market is astounding, as evidenced by one of our major competitors, who has experienced explosive growth averaging 40% per year.
Yet an astounding body of evidence demonstrates that social and commercial determinants of health undermine our ability to freely make healthful choices.
Though he was unable to specify how many calls had been made, or discuss the nature of the conversations, Grewal did say that the astounding outpouring is evidence that such a service was clearly a much needed public good.
Although he hoped to find evidence for their astounding astronomical knowledge, the team found no trace of the detailed Sirius lore reported by Griaule.
That only a plurality of Republicans were willing to acknowledge the president was born in America is nothing short of astounding, considering the preponderance of evidence that confirms his Hawaiian birth.
She preferred to memorialize herself in black and white, as evidenced by the astounding number of portraits for which she posed.
So it is astounding to find no first-hand evidence of the Saroyan voice in John Leggett's paraphrase-filled new biography, "A Daring Young Man".
In particular, the report questioned whether Batlogg should have looked more closely at the evidence supporting Schön's astounding string of reports, which in 2001 were being churned out at a rate of one every 8 days.
Overall, the finding that differences in resting CCTA contrast densities may predict functional relevance is astounding, particularly in view of the evidence that an expected reduction in resting flow only occurs in lesions with a stenosis degree of 90% and above [32, 33].
