spontaneous
used in Hiroshima

only 1 use

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Definition

behaving in an instinctive, uninhibited manner

or:

happening naturally (without planning or external force)

The scars tended in time to shrink spontaneously, and could then be more easily excised, or be left alone.
Five — The Aftermath (19% in)

There are no more uses of "spontaneous" in Hiroshima.

Typical Usage (best examples)