extemporaneous
Speech parts
1. extemporaneous - Adjective
2. extemporaneous - Adjective Satellite
Meaning
Composed, performed, or uttered on the spur of the moment, or without previous study; unpremeditated; off-hand; extempore; extemporary; as, an extemporaneous address or production.
Source: Webster's dictionarySynonyms
Antonyms
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Examples
his ad-lib comments showed poor judgment
an extemporaneous piano recital
an extemporary lecture
an extempore skit
an impromptu speech
offhand excuses