The phrase "proved inefficient" is correct and usable in written English.
It can be used when discussing the failure of a method, system, or process to achieve desired results or efficiency.
Example: "The new software implementation proved inefficient, leading to delays in project completion."
Alternatives: "was found to be ineffective" or "turned out to be unproductive."
Other options to get rid of them, such as trained dogs, have proved inefficient.
Same with apparel, because the current method of handling apparel proved inefficient and far too costly.
Both used DC systems, which proved inefficient for long-distance power transmission.
It is hoped that small automated buses could fill that niche where human-operated transport has proved inefficient with municipal funds.
But the virus delivery method has proved inefficient, and it still lingers under the cloud caused by the death of a patient at the University of Pennsylvania in 1999.
In a November letter to Mr. McEntee, Dr. Dean pointed to the same bills, which allowed Vermont employees to present alternatives before state agencies could contract out, and said privatization had proved inefficient.
Tom Marsh, a first selectman in Chester, said fewer courts would prove inefficient and alienate tax payers.
Hunt sports a Fitbit to track his steps, though sadly it's proving inefficient at monitoring the calories burned while grovelling to Theresa May to keep his job.
John E. Calfee, a health care expert at the American Enterprise Institute, said that federal contracts for drug development could prove inefficient and costly because the government would probably have to cover any costs the companies incurred, plus a profit margin.
Near the Haitian embassy, which had also proven inefficient at issuing the documents necessary for Haitians to comply with the regularization plan, I met Jhonny Jean, a construction worker originally from the north Haitian town of Gonaïves.
There is a growing concern that the billion-dollar program, which is intended to monitor the nation's nuclear stockpile and simulate weapons explosions, has been a disappointment because the M.P.P. computers used by the project have proven inefficient and difficult to program.
