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extempore adjective

  /ɛkˈstɛmpəɹi/ , /ɪkˈstɛmpəɹi/
  • Carried out with no preparation; impromptu.
extemporané

extempore adverb

  /ɛkˈstɛmpəɹi/ , /ɪkˈstɛmpəɹi/
  • Without preparation; extemporaneously.
extemporanément

extemporize verb

  • (intransitive) To perform or speak without prior planning or thought; to act in an impromptu manner; to improvise.
improviser
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