The soldiers, swinging their arms and keeping time spontaneously, marched with long steps.
And Nicholas heard her spontaneous, happy, ringing laughter.
His words and actions flowed from him as evenly, inevitably, and spontaneously as fragrance exhales from a flower.
Almost all day long the house resounded with their running feet, their cries, and their spontaneous laughter.
No command ever appears spontaneously, or itself covers a whole series of occurrences; but each command follows from another, and never refers to a whole series of events but always to one moment only of an event.
There are no more uses of "spontaneous" in the book.
Show samples from other sources
The group broke into spontaneous laughter.
He bubbled with enthusiasms, and his faintest smile or lightest laugh seemed spontaneous and genuine.