The phrase "egregious error" refers to a mistake or wrongdoing that is extremely noticeable, obvious, and very bad.
Sentences with «egregious error»
However, they've also made egregious errors and their work simply hasn't stood up, especially as regards key issues like climate sensitivity. (deepclimate.org)
I hope you have the integrity to contact them and correct your many egregious errors before they become a source of yet further misinformation to the public. (judithcurry.com)
It was the means by which the church was separating itself from egregious error. (firstthings.com)