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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
extemporaneous is an adjective meaning "with little or no preparation or forethought". It carries one recorded sense.
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”
Definitions, synonyms and semantic relations for extemporaneous come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.