Definition of impromptu in English:

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Pronunciation: /ɪmˈprɒm(p)tjuː/

adjective& adverb

Done without being planned or rehearsed: [as adjective]: an impromptu press conference [as adverb]: he spoke impromptu
More example sentences
  • I got a phone call announcing impromptu dinner plans, so I decided to join in on that.
  • Buoyed by the success of the day, we now plan to hold an impromptu New Year's eve bash here.
  • Sure enough, there are bedrooms and a kitchen and even a drum set up in the entrance for impromptu rehearsals.
unrehearsed, unprepared, unscripted, extempore, extemporized, improvised, improvisational, improvisatory, improvisatorial, spontaneous, unstudied, unpremeditated, unarranged, unplanned, on the spot, snap, ad lib;
ad hoc, thrown together, cobbled together, rough and ready;
Latin ad libitum
informal off-the-cuff, spur-of-the-moment
rare extemporaneous
extempore, spontaneously, without preparation, without rehearsal, on the spur of the moment, offhand, ad lib;
Latin ad libitum
informal off the cuff, off the top of one's head
rare extemporaneously

noun (plural impromptus)

A short piece of instrumental music, especially a solo, that is reminiscent of an improvisation.


Mid 17th century (as an adverb): from French, from Latin in promptu 'in readiness', from promptus (see prompt).

For editors and proofreaders

Line breaks: im|promptu

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