The phrase "a sufficiently good" is correct and usable in written English.
It can be used to describe something that meets an adequate level of quality or standard.
Example: "The results of the experiment were a sufficiently good indication of the hypothesis being correct."
Alternatives: "an adequately good" or "a reasonably good".
Sufficiency holds that all persons equally have a claim to live a sufficiently good life, and that people's condition is relevantly and importantly equal when all equally live at or above the level of sufficiency.
But he's a sufficiently good student to have picked up valuable pointers from both.
"It's a sufficiently good business deal that you would think it would attract more interest," he said.
Scowcroft does not believe that the promotion of American-style democracy abroad is a sufficiently good reason to use force.
The models producing these forecasts (the NAM model and European model) had a sufficiently good enough track record to take them seriously.
Brand simply doesn't appear to be having a sufficiently good time herself to make us feel safe to have a good time in her presence.
Schmidt was a sufficiently good musician to record Bach and Mozart concertos and even to have made an album entitled Helmut Schmidt Chancelloror and Pianist.
The three-person panel did not accept that Winston had a sufficiently good reason to be excused for the three hits down Zenarinda's shoulder.
Many copolymerization mathematical models can do a sufficiently good job for several macroscopic reactor outputs, but how about predicting microstructural properties reliably?
As the regularization parameter ϵ→1, the obtained solution is shown to be a sufficiently good approximate solution for the particular Cauchy integral equation.
Discovering incongruences and converging at least towards a decoupled structure could suggest to designers that they have reached a sufficiently good starting point for the product under development.
