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Adjective: extemporaneous  ik,stem-pu'rey-nee-us
  1. With little or no preparation or forethought
    "an extemporaneous piano recital";
    - ad-lib, extemporary, extempore, impromptu, offhand, offhanded, off-the-cuff, unrehearsed

See also: unprepared

Encyclopedia: Extemporaneous