The phrase "as deficient" is correct and usable in written English.
It can be used to describe something that is lacking or insufficient in a particular quality or characteristic.
Example: "The report was deemed as deficient in providing adequate evidence to support its claims."
Alternatives: "considered inadequate" or "regarded as lacking."
Were they as sturdy as their 21-14 record suggested on Jan . 7 Or as deficient as their four-game losing streak implies?
Yet the informational content of advertising may not be as deficient as its critics believe; advertising itself meets two market tests.
Rural schools, like many in the Rust Belt, are as deficient as inner city schools.
Closer exploration of the situation often indicates that you are not as deficient as you think and nor are those fortunate experiences impossible for you.
Gubar indicts current ovarian-cancer treatments as "deficient and debasing".
Such clients judged Wadsworth's affinity with children proof that he was as deficient in understanding as the children were.
On Sept. 5, the Vatican issued a document by Cardinal Ratzinger that laid out the primacy of the Roman Catholic Church and described other denominations as "deficient".
The victims, on the other hand, are characterized by her sources as "deficient in self-esteem, perpetually seeking care, protection, and love" from these alluring folk.
Prosecutors declined to explain their interest, but no one has characterized the law firm's work as deficient or its bills as fraudulent.
"We are at a loss to understand why the federal government is suddenly viewing New York City's Local Law 58 as deficient and unsatisfactory".
Nationally, an Associated Press analysis of Federal Highway Administration records found that 29percentt of 588,000 bridges were rated as "deficient" as of Aug. 31, 2000.
