All 3 Uses

spontaneous
in
The Wedding, by Nicholas Sparks
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Her father was the kind of man who would hold his wife's hand in the hours after dinner or spontaneously pick a bouquet of wildflowers on his way home from work.†
Chpt 1

spontaneously = happening in a natural manner without planning or external force
We've made love infrequently these last few years, and when we did, it lacked the spontaneity and excitement we'd enjoyed in the past.†
Chpt 2 *

spontaneity = behavior or action that happens naturally without planning or external force
No longer are you simply husband and wife, you are mother and father as well, and all spontaneity vanishes immediately.†
Chpt 2

Definitions:

(1) (spontaneous)
happening naturally, suddenly, or without outside planning or action
(2) (meaning too rare to warrant focus)