extemporaneous

Definitions

Spoken or done without preparation; impromptu.

Composed, performed, or uttered on the spur of the moment.

Examples

The professor gave an impressive extemporaneous lecture on quantum physics without using a single note.

She was praised for her extemporaneous speech, which captured the audience's attention despite being completely unplanned.

Although he had not prepared a formal presentation, his extemporaneous remarks provided a thoughtful conclusion to the meeting.

Synonyms

impromptu unrehearsed spontaneous improvised off-the-cuff ad-lib unprepared

Antonyms

rehearsed prepared planned scripted studied practiced deliberate