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1. Happening or arising without apparent external cause; self-generated: a microorganism capable of spontaneous movement.
2. Arising from a natural inclination or impulse and not from forethought or prompting: spontaneous laughter; a spontaneous protest.
3. Unconstrained and unstudied in manner or behavior: a spontaneous personality.
4. Growing without cultivation or human labor: spontaneous vegetation.

[From Late Latin spontāneus, of one's own accord, from Latin sponte; see (s)pen- in Indo-European roots.]

spon·ta′ne·ous·ly adv.
spon·ta′ne·ous·ness n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.spontaneousness - the quality of being spontaneous and coming from natural feelings without constraint; "the spontaneity of his laughter"
naturalness - the quality of being natural or based on natural principles; "he accepted the naturalness of death"; "the spontaneous naturalness of his manner"
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(spənˈteiniəs) adjective
1. said, done etc of one's own free will without pressure from others. His offer was quite spontaneous.
2. natural; not forced. spontaneous behaviour.
sponˈtaneously adverb
sponˈtaneousness noun
spontaneity (spontəˈneiəti) , (spontəˈniːəti) noun
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References in periodicals archive ?
What else would we have to bang on about in the office the following morning were it not for the likes of Johnny Vegas' annual off-the-cuff ranting (once wildly spontaneousness, but ironically something you can now set your watch by), the naffness of host Jonathan Ross' tumbleweed-inducing monologue and an overexcited (and hugely bladdered) Alan Carr kissing a mortifiedlooking David Mitchell full on the lips?
The sense of spontaneousness that often characterizes populist movements means that they tend to be short-lived and episodic, emerging as political phenomena that occupy only discrete "populist moments" in history.
that's still the case but I'm noticing in more recent days a revival of courage, neighbourliness, mutual support, spontaneousness acts of kindness.