(·adv / ·adj) offhand; without previous study; extemporaneous; extempore; as, an impromptu verse.
2. impromptu ·noun a piece composed or played at first thought; a composition in the style of an extempore piece.
3. impromptu ·noun something made or done offhand, at the moment, or without previous study; an extemporaneous composition, address, or remark.