Impromptu creation refers to something created on the spot without prior planning. Some synonyms for impromptu creation include spontaneous creation, ad-lib creation, improvisational creation, extemporaneous creation, and impulsive creation. Spontaneous creation suggests something created without any premeditation or forethought. Ad-lib creation implies something created without a script or pre-planned ideas. Improvisational creation is often associated with performances, where the artist creates something new on the spot to entertain the audience. Extemporaneous creation suggests creation without prior preparation, while impulsive creation implies something created on a whim or sudden impulse. These synonyms help to convey the meaning of impromptu creation in different contexts.