The phrase "as unsound" is correct and usable in written English.
It can be used to describe something that is not based on sound reasoning or is flawed in some way.
Example: "The argument presented in the debate was deemed as unsound by the panel of experts."
Alternatives: "as flawed" or "as invalid".
The claim is as unsound as the fictitious assertion of expediency by which it is sought to be supported.
But at this point, it seems to me that Count I is just as unsound as Count II.
So Macaulay's conclusions were as unsound as those of his father.
In its pristine formulation, an increasing number of courts have rejected the principle as unsound.
BACK COOLIDGE ECONOMY Instalment Buying Is Assailed as Unsound -- Campaign on Commercial Frauds Planned.
Nothing would be said to her face, but she would be regarded as unsound'.
The private insurance industry, which lobbied energetically but unsuccessfully to strip the Class Act from the health care bill, continues to condemn it as actuarially unsound.
The implication, if not explicit charge, was that panel members had a vested financial interest in dismissing CCSVI and liberation therapy as scientifically unsound so as to maintain the status quo.
In London he revealed to the Financial Times that he was carrying Smith's "The Theory of Moral Sentiments" in his suitcase.As Mr Wen explains it, an important message of this book is that if the fruits of economic development are not shared by all, that is "morally unsound", as well as a threat to social stability.
In my view, it is fundamentally unsound, as well as grossly unfair, to deny recovery to those who are completely without cognitive capacity while permitting it for those with a mere spark of awareness, regardless of the latter's ability to appreciate either the loss sustained or the benefits of the monetary award offered in compensation.
A compiler that implements the language can be incomplete, or even unsound, as long as in some sense it approximates the logical specification.
