extempore \ik-STEM-puh-ree\, adverb:
1. Without premeditation or preparation; on the spur of the moment.
1. Done or performed extempore.
Kelso had already delivered his short paper, on Stalin and the archives, at the end of the previous day: delivered it in his trademark style--without notes, with one hand in his pocket, extempore, provocative.
-- Robert Harris, Archangel