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1. Carried out or performed with little or no preparation; impromptu: an extemporaneous piano recital.
2. Prepared in advance but delivered without notes or text: an extemporaneous speech.
3. Skilled at or given to unrehearsed speech or performance: an accomplished extemporaneous speaker.
4. Provided, made, or adapted as an expedient; makeshift: an extemporaneous policy decision.

[From Late Latin extemporāneus, from Latin ex tempore; see extempore.]

ex·tem′po·ra·ne′i·ty (-pər-ə-nē′ĭ-tē) n.
ex·tem′po·ra′ne·ous·ly adv.
ex·tem′po·ra′ne·ous·ness n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adv.1.extemporaneously - without prior preparation; "he spoke extemporaneously"
à la voléeextemporanément
References in classic literature ?
with the single exception perhaps of the tragic muse, when playing extemporaneously on the barrel organ before the East India Company) can parallel.
He doesn't memorize scripts but lists an outline then he takes it from there extemporaneously.
Tenders are invited for Services for the manufacture of medicines extemporaneously for 2018
While everyone froze, Harry volunteered by extemporaneously reciting a long but well-articulated answer that left us gushing in whispers: 'That guy is a graduate of the University of Michigan.
Martinez contends: (1) her attorney was ineffective because he misplaced a written statement Martinez intended to read at the sentencing hearing, thereby requiring her to speak extemporaneously, compromising her right of allocution; and (2) counsel failed to withdraw after Martinez allegedly notified him that she wanted to hire a different attorney for the sentencing hearing, violating her right to an attorney of her choosing.
The 116th club meeting also featured a table topic session, a session in every Toastmaster Meeting where guests or member is asked to speak extemporaneously on a specific subject or question read by the table topic master.
The two other men who had been given rough drafts also testified that McCarthy did not simply read his speech, but rather spoke extemporaneously.
One presenter didn't begin speaking extemporaneously (prepared but not using notes) until he had spent nearly two decades writing his speeches word-for-word.
Trump's Brexit remarks were delivered extemporaneously, but everything he said about free trade appeared to come from a campaign-approved script.
The drugs--fluoxetine and reboxetine (purchased from Sigma-Aldrich Chemical Company)--were extemporaneously dissolved in 0.
Extemporaneously countering and crafting arguments is a passion of mine.
The same woman who can write snappy, smart dialogue for days was so introverted that she completely avoided situations in which she'd have to speak extemporaneously, be interviewed or face an unknown situation.