The act of creating or performing something spontaneously without preparation, especially in music, theater, or speech.
His piano performance was complete improvisation.
noun which may take the genitive case particle 'no'
Describes something done or made on the spot without planning; often used as a prenominal modifier (即興の〜).
I was asked to give an impromptu speech.
He gave an impromptu speech.
This is an improvised tune.
improvisation; impromptu performance
improvisational poet; improviser (poet)