extempore
adjective
1. with little or no preparation or forethought
- an extemporaneous piano recital
- an extemporary lecture
- an extempore skit
Similar word(s): unprepared, extemporaneous, extemporary, impromptu, offhand, offhanded, unrehearsed
adverb
1. without prior preparation
- he spoke extemporaneously
Similar word(s): extemporaneously, extemporarily
noun
1. Something improvised.