"practically unfeasible" is correct and usable in written English.
You can use it when you want to describe something that is almost impossible to achieve. For example, "It would be practically unfeasible to finish this project in two weeks."
But replacing the road would entail acquiring and razing residential neighborhoods in order to widen the road, a prospect that the state officials consider "socially, financially and practically unfeasible, " according to Eileen Peters, a department spokeswoman.
And he teed up the third by seizing the ball in the Dutch box, dashing past a defender and playing a reverse pass that seemed practically unfeasible at the speed he was running, and the angle he was at, presenting Allofs with a chance to make it 3-0.
Diebold rejected both studies as practically unfeasible.
However, as previously noted, this scheme is practically unfeasible.
The direct estimation of this strength is practically unfeasible, due to difficulties in sampling and testing.
However, with a chain of forwarding operations, the derivation becomes overwhelmingly complex and practically unfeasible.
In large-scale epidemiologic studies addressing health risks related to hormonal active xenobiotics, it is practically and economically unfeasible to measure serum levels of more than a few compounds.
Only a small number of HER2 combination therapies have been evaluated in RCTs, as it was noted in a previous meta-analysis (Harris et al. [ 44]), but it would be practically and economically unfeasible and unrealistic to perform a phase III trial to evaluate all possible combinations.
It followed, the former officials said, that exclusive enforcement by the federal agency was "logistically, practically, legally and politically unfeasible".
However, the former federal officials told the Supreme Court that exclusive enforcement by the Department of Health and Human Services was "logistically, practically, legally and politically unfeasible".
Self-practice of stroke survivors is unfeasible.
