extempore

Adverb
  1. Without prior preparation (synset 400336906)
    "he spoke extemporaneously"
    same as: extemporaneously, extemporarily
Adjective
  1. With little or no preparation or forethought (synset 301851375)
    "his ad-lib comments showed poor judgment"; "an extemporaneous piano recital"; "an extemporary lecture"; "an extempore skit"; "an impromptu speech"; "offhand excuses"; "trying to sound offhanded and reassuring"; "an off-the-cuff toast"; "a few unrehearsed comments"
    similar to: unprepared - without preparation; not prepared for
    same as: ad-lib, extemporaneous, extemporary, impromptu, off-the-cuff, offhand, offhanded, unrehearsed

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