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