spontaneousness

spon·ta·ne·ous  (spn-tn-s)

adj.

1. Happening or arising without apparent external cause; self-generated.

2. Arising from a natural inclination or impulse and not from external incitement or constraint.

3. Unconstrained and unstudied in manner or behavior.

4. Growing without cultivation or human labor.

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

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spon·tane·ous·ly adv.

spon·tane·ous·ness n.

Synonyms: spontaneous, impulsive, instinctive, involuntary, automatic
These adjectives mean acting, reacting, or happening without apparent forethought or prompting. Spontaneous applies to what arises naturally rather than resulting from external constraint or stimulus: "The highest and best form of efficiency is the spontaneous cooperation of a free people" (Woodrow Wilson).
Impulsive refers to the operation of a sudden urge or feeling not governed by reason: Buying a car was an impulsive act that he immediately regretted.
Instinctive implies behavior that is a natural consequence of membership in a species. The term also applies to what reflects or comes about as a result of a natural inclination or innate impulse: Helping people in an emergency seems as instinctive as breathing.
Involuntary refers to what is not subject to the control of the will: "People drew in their breath with involuntary surprise and suspense" (Harriet Beecher Stowe).
Automatic implies an unvarying mechanical response or reaction: She accepted the subpoena with an automatic "thank you."

Thesaurus

Noun

1.

spontaneousness - the quality of being spontaneous and coming from natural feelings without constraint; "the spontaneity of his laughter" spontaneity naturalness - the quality of being natural or based on natural principles; "he accepted the naturalness of death"; "the spontaneous naturalness of his manner"