The question is a contridiction in itself. Impromptu speeches are exactly that, you shouldn't or don't have time to have a topic in mind. It generally stems from someone asking you a question or asking you to give a presentation minutes before you are scheduled to speak. You should prepare just as you would for any other speech. Gather your thoughts together in an outline; intro, body, and conclusion. You should be as prepared as possible but it is impossible to be fully prepared because it is impromptu.
Impromptu is an adjective.
No. With impromptu speeches, you usually are given 15 minutes to write them, and 5 minutes for review. Therefore you wouldn't have enough time to do research. The topics are usually based upon your opinion or experiences, or imagination. You don't need to research for an impromptu speech.
without previous preparation impromptu speech was made to the crowd
advantages and disadvantages of Impromptu presentation
I delivered an impromptu speech in front of a very big crowd.
Impromptu speeches can be more honest and from the heart. However, without a script, a speech can get repetitive and mixed up.
if it is dog poo
One should end an impromptu speech with a joke that brings the speech back to the opening lines. In this way, the speech can come full circle and end on a high note.
It is something that is made or done without previous preparation. An impromptu dinner is hastily prepared. An impromptu speech that was off the cuff and unprepared. An impromptu address to unexpected crowds
Applications in nanotechnology
impromptu
An impromptu speech is a speech or presentation that is given without any prior preparation or planning. Speakers must think on their feet and deliver a coherent and effective message on the spot. Impromptu speeches often showcase a speaker's ability to communicate effectively and think quickly under pressure.