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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 ?
According to respondents serving international timber markets, the domestic sector is discordant with written legislation and it will be difficult, if not impossible, to render such an extemporarily or non-regulated sector compatible with the VPA.
Due to their subtle appearance and symptomatology as a typical subcutaneous lump, Granular cell tumors are often extemporarily misdiagnosed with histological examination setting the correct diagnosis subsequently, which carries significant clinical importance for follow-up and further management of these rare tumors.
The process of obtaining extemporarily enteric capsules adequate has many variables conditioned to technique and to handling which may impact the performance of other stocks.