The phrase 'blatantly failed' is correct and usable in written English.
You can use it when you want to emphasize that something failed in a very noticeable, obvious, or open way. For example: "John blatantly failed the test despite all his hard work studying."
Yet despite countless appeals to Him, not only over the last few years, but over many centuries, to bring peace to the world, He has blatantly failed to deliver us from evil.
Last week, the European Union's senior trade negotiator in Geneva, Carlo Trojan, did not mince words in a letter to his American counterpart, Linnet Deily, saying the United States had "blatantly failed to respect" the group's rules.
More troubling still, Moffat's Adler blatantly fails to outwit Holmes.
If a prosecutor so blatantly fails to do his job, surely there is swift and powerful punishment.
Guantánamo Bay continues to be a disgrace and a contradiction of the noble principles that this country proclaims so proudly but so blatantly fails to practice.
"The Amateur" by Edward Klein is a book about an inept, arrogant ideologue who maintains an absurdly high opinion of his own talents even as he blatantly fails to achieve his goals.
"It's about: How can you so blatantly fail to represent us and protect our safety?" According to a report in the Washington Post, there is even a possibility that extending background checks could return to the Senate's agenda in the coming weeks and months.
And yet, time and again, over these past six months, ministers have evoked language and principles in their crusade against renewable energy, which they blatantly then fail to apply to gas, its ugly sister fracking and the white elephant of nuclear power.
PALGN's Mat Keller wrote that the Origins "blatantly obvious" subtext failed to affect the player, in contrast to the subtext of previous installments.
They introduced it on September 12. Then Republicans decided to throw that reasonable piece of legislation under the bus in favor of the unpopular Graham-Cassidy bill, another crack at repealing and replacing the ACA, and a blatantly desperate bid that failed just as badly as their previous efforts had.
While the startup still had money in the bank, a massive redesign that blatantly copied competitor Yik Yak failed.
