The phrase "are not attainable" is correct and usable in written English.
It can be used when discussing goals, objectives, or outcomes that cannot be achieved or reached.
Example: "Despite our best efforts, some of our targets are not attainable within the given timeframe."
Alternatives: "cannot be achieved" or "are out of reach".
Its aims (imposing Western-style democracy) are not attainable.
These civil, social and political objectives in modern society are not attainable by armed force.
The Dish offer, he added, would yield "substantial synergies that are not attainable through the pending SoftBank proposal".
This immediately gives all quadratic operators as well, while operators of higher degree are not attainable.
2D materials often possess physical and chemical properties that are not attainable in their bulk counterpart.
Examination of the asymptotic behavior of the film downstream shows that some of the possible uniform film thicknesses are not attainable.
If necessary, we contacted city representatives by telephone or email to confirm findings or provide information that was not attainable from the city web pages.
Since perfect decorrelation between the closed-loop output and the disturbance is not attainable with a restricted-complexity controller, the cross-correlation of these two signals is minimised.
When the peptides were spread at a liquid phase on subphase, the peptides took a vertical orientation, which was not attainable by compression of peptide monolayers initially spread at a gas phase on subphase.
It is said that Swaminarayan dispelled the myth that moksha (salvation) was not attainable by everyone.
Based on results from measuring 2ME level in huLM and other cell lines, the concentration of 2ME which can inhibit cell proliferation or affect the cytoskeleton is not attainable under the normal expression level of COMT.
