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Spoken, done, or composed with little or no preparation or forethought: an extemporary lecture.

[From extempore.]

ex·tem′po·rar′i·ly (-râr′ə-lē) adv.
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Adv.1.extemporarily - without prior preparation; "he spoke extemporaneously"
References in periodicals archive ?
Deliberately punning Qavi to belittle his inquisitor, he extemporarily recited:
Alhal: a type of folk versification presented extemporarily by an endowed guest poet who appraises the host and the occasion of the invitation.
Possessed of a wild, mercurial energy, most of these poems feel less written than extemporarily performed: they make extensive use of quotation, allusion, stylistic borrowings; spoken-word effects abound (repetition, stutter, quick and simple rhymes and puns); and there is a grand, sometimes self-congratulatory show of improvisation: "I meant: Yikes