impracticable

剑桥词典

If a course of action , plan , etc. is impracticable, it is impossible to do in an effective way.
（行动方案、计划等）行不通的，不可行的
The changes to the tax system proved impracticable as they were impossible to enforce . 税制改革因无法实施而被证明是行不通的。 返回 impracticable