ADJ
grave, serious, terrible | financial, political
VERB + MISCALCULATION
make
noun
An incorrect or mistaken calculation.
An error in judgment.
noun — a mistake in calculating
That was a slight miscalculation.
Due to the miscalculation, they lost valuable time.
They have also found that the same miscalculation was made in some other cases.
There might have been a miscalculation.
It was a miscalculation.
Dying because of... hail? Now that's a miscalculation and a half.