impracticable

US /ɪmˈpræk.tɪ.kə.bəl/
UK /ɪmˈpræk.tɪ.kə.bəl/
1.

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If a course of action, plan, etc. is impracticable, it is impossible to do in an effective way:

:
The changes to the tax system proved impracticable as they were impossible to enforce.