Spontaneous vs. Extemporaneous — What's the Difference?

Difference Between Spontaneous and Extemporaneous
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Definitions
Spontaneous➦
Happening or arising without apparent external cause; self-generated
A microorganism capable of spontaneous movement.
Extemporaneous➦
Carried out or performed with little or no preparation; impromptu
An extemporaneous piano recital.
Spontaneous➦
Arising from a natural inclination or impulse and not from forethought or prompting
Spontaneous laughter.
A spontaneous protest.
Extemporaneous➦
Prepared in advance but delivered without notes or text
An extemporaneous speech.
Spontaneous➦
Unconstrained and unstudied in manner or behavior
A spontaneous personality.
Extemporaneous➦
Skilled at or given to unrehearsed speech or performance
An accomplished extemporaneous speaker.
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Spontaneous➦
Growing without cultivation or human labor
Spontaneous vegetation.
Extemporaneous➦
Provided, made, or adapted as an expedient; makeshift
An extemporaneous policy decision.
Spontaneous➦
Self-generated; happening without any apparent external cause.
He made a spontaneous offer of help.
A make spontaneous decision
Extemporaneous➦
With inadequate preparation or without advance thought; offhand.
Spontaneous➦
Done by one's own free choice, or without planning.
Extemporaneous➦
Composed, performed, or uttered on the spur of the moment, or without previous study; unpremeditated; off-hand; ad-lib; extempore; extemporary; as, an extemporaneous address or production.
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Spontaneous➦
Proceeding from natural feeling or native tendency without external or conscious constraint.
Extemporaneous➦
With little or no preparation or forethought;
His ad-lib comments showed poor judgment
An extemporaneous piano recital
An extemporary lecture
An extempore skit
An impromptu speech
Offhand excuses
Trying to sound offhanded and reassuring
An off-the-cuff toast
A few unrehearsed comments
Spontaneous➦
Arising from a momentary impulse.
Spontaneous➦
Controlled and directed internally; self-active; spontaneous movement characteristic of living things.
Spontaneous➦
Produced without being planted or without human cultivation or labor.
Spontaneous➦
Sudden, without warning.
Spontaneous➦
Proceeding from natural feeling, temperament, or disposition, or from a native internal proneness, readiness, or tendency, without constraint; as, a spontaneous gift or proposition.
Spontaneous➦
Proceeding from, or acting by, internal impulse, energy, or natural law, without external force; as, spontaneous motion; spontaneous growth.
Spontaneous➦
Produced without being planted, or without human labor; as, a spontaneous growth of wood.
Spontaneous joys, where nature has its play,The soul adopts, and owns their firstborn away.
Spontaneous➦
Happening or arising without apparent external cause;
Spontaneous laughter
Spontaneous combustion
A spontaneous abortion
Spontaneous➦
Said or done without having been planned or written in advance;
He made a few ad-lib remarks
Spontaneous➦
Produced without being planted or without human labor;
Wild strawberries