1. spoken or done without preparation or advance thought; impromptu

Examples

• The speaker gave an extemporaneous speech after being called to the podium unexpectedly.
• Her extemporaneous remarks at the meeting were surprisingly insightful.
• The debate required extemporaneous responses to challenging questions.
• He was known for his ability to deliver extemporaneous presentations.
• The comedian’s extemporaneous jokes had the audience laughing throughout the show.
• Students practiced extemporaneous speaking to improve their communication skills.