extemporaneous

/ek-stem-puh-RAY-nee-us/adjective

spoken or done without preparation

Her extemporaneous answer outshone every rehearsed speech.
Synonyms
impromptu, unrehearsed, offhand
Antonyms
rehearsed, scripted
Root
temp- (time)
Memory hook
ex tempore (out of the time): made up in the moment.

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