← DefinitionshareGuessimpromptuadjectiveDone or said without planning or preparation; spontaneous.adverbWithout preparation or planning; spontaneously.nounSomething that is done or said without preparation, especially a short speech or performance.SynonymsspontaneousadjectiveoffhandadjectiveunrehearsedadjectiveextemporaneousadjectiveAntonymsplannedadjective