unavoidable : Idioms & Phrases
unavoidable casualty
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noun a natural and unavoidable catastrophe that interrupts the expected course of events
force majeure; act of God; inevitable accident; vis major.
- he discovered that his house was not insured against acts of God
WordNet
Unavoidable hemorrhage
(Med.) , hemorrhage produced by the afterbirth, or placenta, being situated over the mouth of the womb so as to require detachment before the child can be born.