unrehearsed
Definitions
Not practiced or prepared in advance.
Spontaneous and lacking formal rehearsal.
Examples
The comedian's unrehearsed jokes were the highlight of the entire show.
She gave an unrehearsed speech that felt much more sincere than the prepared version.
Synonyms
impromptu extemporaneous spontaneous improvised off-the-cuff unprepared ad-lib
Antonyms
rehearsed prepared practiced scripted planned studied deliberate