adjective. Prompted by the occasion rather than being planned in advance.

adjective. Spoken, performed, done, or composed with little or no preparation; extemporaneous.

adverb. With little or no preparation; extemporaneously.

noun. Something, such as a speech, that is made or done extemporaneously.

noun. A short composition, especially for the piano, performed in an offhand or extemporized style.

Prompt; offhand; extempore; extemporized for the occasion: as, an impromptu epigram.

noun. Something said or written, played, etc., at the moment, or without previous study or preparation; an extemporaneous composition or performance.

noun. In music: An extemporized composition; an improvisation.

noun. A composition in irregular form, as if extemporized; a fantasia.

Offhand; without previous study or preparation: as, a verse written impromptu.

adverb. Offhand; without previous study; extemporaneous; extempore.

noun. Something made or done offhand, at the moment, or without previous study; an extemporaneous composition, address, or remark.

noun. A piece composed or played at first thought; a composition in the style of an extempore piece.

adjective. Improvised; without prior preparation; extemporaneous; unplanned.

noun. a short musical composition for an informal occasion often with the character of improvisation and usually to be played solo.

noun. any composition, musical or otherwise, that is created on the spot without preparation.

noun. an extemporaneous speech or remark

adverb. without advance preparation

noun. a short musical passage that seems to have been made spontaneously without advance preparation

adjective. with little or no preparation or forethought

"They are resourceful people and impromptu is the mode of operation they most relish."

unprepared  

address  musical passage  passage  speech  

annual  elaborate  farewell  festive  grand  

ad lib  ad libitum  ad-lib  ad-libbing  arrangement