Fromextemporaneous +‎-ly.

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extemporaneously (notcomparable)

1. In anextemporaneous manner; without priorpreparation orplanning.

   Synonym:impromptu

   Considering that he was speakingextemporaneously, he covered the subject pretty well.

   • 2021 April 29, Katherine Rosman, “Girl, Wash Your Timeline”, inThe New York Times‎^[1],→ISSN:

     She recounted that while speakingextemporaneously during a livestream, she mentioned her twice-weekly housekeeper who “cleans the toilets.”

• improvisationally
• provisionally

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