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• s  with little or no preparation or forethought
  an extemporary lecture

• In a baseball park on the outskirts of Manhattan, 20,000 people assembled while Kleig lights concentrated their glare upon an extemporary stage erected over second base.
• The singer (Lilyan Tashman) has been exiled by the police from Budapest to the familiar Hungarian musical comedy steppesa district of palaces, vineyards, and extemporary .

• ad-lib
• extemporaneous
• extempore
• impromptu
• offhand
• offhanded
• off-the-cuff
• unrehearsed