naobon

English: Translation
To have remained or been left behind; to have survived another person; to be among those left after a death.
Notes

naobon (na- + obon)

This profiles the resulting state:

something or someone was left behind, remained, or survived.

It may be accidental in many contexts, but na- does not inherently mean “accidental.” Accidental or unintended interpretation normally arises from the construction and context.

The bereavement sense is an important semantic extension:

those who remain after another person has died.