extemporarily
1. [ adverb ] without prior preparation
Synonyms: extempore extemporaneously
Examples:

"he spoke extemporaneously"

Related terms: ad-lib ad-lib ad-lib
Similar spelling:   extemporary
  extemporaneously
  extemporize
  extemporise
  ex_tempore
  extemporaneous
  extemporization
  extemporisation