extemporaneity

/ɪkˌstɛmpərəˈniːəti/
noun
  1. The quality or state of being done or said without preparation; spontaneity.
    • The speech lacked extemporaneity because it was read word for word from a script.
    • The extemporaneity of his performance made it feel fresh and exciting.
    • She admired the extemporaneity of the jazz musicians as they improvised together.
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