impracticability
impracticability, unfeasibility
Невыполнимость плана стала ясна через месяц.
The impracticability of the plan became clear after a month.
Все говорили о невыполнимости этого проекта.
Everyone talked about the impracticability of this project.
Неисполнимость плана стала ясна всем сразу.
The impracticability of the plan became clear to everyone immediately.