"extempore" in the adjective sense
1. ad-lib, extemporaneous, extemporary, extempore, impromptu, offhand, offhanded, off-the-cuff, unrehearsed
with little or no preparation or forethought
"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"
"extempore" in the adverb sense
1. extemporaneously, extemporarily, extempore
without prior preparation
"he spoke extemporaneously"
Source: WordNet® (An amazing lexical database of English)
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