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.

created by improvisation; impromptu; unrehearsed.

simple past tense and past participle of improvise

plural of improviser

Third-person singular simple present indicative form of improvise

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.

present participle of improvise

improvisation

Having the nature of an improvisation.