Impromptu

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Impromptu

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