created by improvisation; impromptu; unrehearsed.

simple past tense and past participle of improvise

improvisation

present participle of improvise

Third-person singular simple present indicative form of improvise

Having the nature of an improvisation.

plural of improvisation

The act or art of composing and making music, poetry, and the like, extemporaneously / That which is improvised; an impromptu. / Musical technique, characteristic of blues music.

To make something up or invent it as one goes on; to proceed guided only by imagination, intuition, and guesswork rather than by a careful plan.

One who improvises.