impromptu meaning , definition, what is impromptu : done or said without any preparation or ...: Learn more. Add to word list done or said without earlier planning or preparation: an impromptu speech (Definition of impromptu from the Cambridge Academic Content Dictionary © Cambridge University Press) Impromptu definition: made or done without previous preparation .. See examples of IMPROMPTU used in a sentence. Impromptu most often describes things, such as speeches or gatherings, that are not prepared ahead of time but that instead happen spontaneously . An impromptu concert or photoshoot, for example, is conceived and executed in the moment.
