The phrase "astonishingly poor" is correct and usable in written English.
It can be used to describe something that is surprisingly or shockingly lacking in quality or performance.
Example: "The service at the restaurant was astonishingly poor, leaving us disappointed and frustrated."
Alternatives: "remarkably inadequate" or "surprisingly substandard".
Dunphy: "They were astonishingly poor".
8.13pm BST Rose's tee shot at 3 is astonishingly poor, almost a slice into the gallery and behind the grandstand to the right of the par three.
That wasn't the easiest of chances, at high speed and at a tight angle, but nevertheless that was an astonishingly poor attempt, not even close.
Inspired by Juan Sebastian Veron, they came out to produce one of football's most remarkable comebacks thanks to a five-star second-half performance that was as astonishingly good as the first half's had been astonishingly poor.
It did, however, give foreign visitors a chance to experience something the locals know so well that they have a name for it: the custo Brasil (Brazil cost).Compared with other middle-income countries, Brazil is astonishingly poor value for money.
And since a spectacular 2004 which saw him make the top 10 of all four majors – a super-staunch steadiness which included second-placed finishes at both the Masters and the Open – he had won only three tournaments on tour, an astonishingly poor return for a player of his stature.
The web material on MTV Online the other night was astonishingly, achingly, poor.
The timescale looks astonishingly short.
Astonishingly, 150 million poor people worldwide, mostly women, now have micro-business loans, but this achievement still meets just 10-15 percent of global demand.
Perhaps the school should now put on a ballet about a poor but astonishingly talented boy who becomes a mayor.
The Royal Ballet says this is also partly thanks to "Billy Elliot", a movie about a poor but astonishingly talented boy who becomes a ballet star.
