impromptu

American  

[im-promp-too, -tyoo] / ɪmˈprɒmp tu, -tju /

adjective

1. made or done without previous preparation.

   an impromptu address to the unexpected crowds.

2. suddenly or hastily prepared, made, etc..

   an impromptu dinner.

3. improvised; having the character of an improvisation.

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adverb

1. without preparation.

   verses written impromptu.

noun

• impromptus
  plural

1. something impromptu; an impromptu speech, musical composition, performance, etc.

2. a character piece for piano common in the 19th century and having, despite its title, a clear-cut form.

impromptu British  

/ ɪmˈprɒmptjuː /

adjective

1. unrehearsed; spontaneous; extempore

2. produced or done without care or planning; improvised

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adverb

1. in a spontaneous or improvised way

   he spoke impromptu

noun

1. something that is impromptu

2. a short piece of instrumental music, sometimes improvisatory in character

Synonym Usage

See extemporaneous.

Other Word Forms

Noun Inflected Forms

• impromptus
  plural

Etymology

Origin of impromptu

First recorded in 1660–70; from French, from Latin in promptū “in readiness”; see in, prompt

Explanation

Some of the best kinds of parties are impromptu ones, when you decide at the last minute to get together. The adjective impromptu describes things done or said without previous thought or preparation. Impromptu is also used as an adverb: Most people are not able to speak impromptu in front of an audience. This word was borrowed from French and ultimately derives from the Latin in prōmptū ("at hand, in readiness") from in ("in") plus a form of prōmptus ("readiness"). As you can guess from the spelling, the adjective and verb prompt are related to impromptu; they are from the same Latin verb, prōmere, "to bring forth."

Example Sentences

See Examples For:

impromptu impromptus

Also aboard the plane in the impromptu meeting: Adm.

From The Wall Street Journal ● Jul. 29, 2026

To market their goods, they turned to an informal network of African American artists, staging pop-up exhibitions in people’s homes and in other impromptu locations.

From Los Angeles Times ● Jul. 27, 2026

The booming rock ballad Don't Look Back in Anger also took on a greater significance after it was sung, impromptu, at a vigil for those who lost their lives in the 2017 Manchester Arena attack.

From BBC ● Jul. 22, 2026

When Salazar pressed play, it kicked off an impromptu karaoke session, and the team joined in.

From The Wall Street Journal ● Jul. 11, 2026

An arrangement was made to build an impromptu prison on high ground in New Orleans.

From "Zeitoun" by Dave Eggers

For the first half, he joined three otherworldly impromptus — Drei Klavierstücke, Opus 946 — written in Schubert’s last months with the Third Sonata by the neglected Soviet composer Dmitri Kabalevsky.

From Los Angeles Times ● Jan. 29, 2025

For the occasion Mr. Lubimov looked at the forward end of the fortepiano repertory, beginning and ending with late Beethoven sonatas and offering a Glinka rarity and a pair of Schubert impromptus between them.

From New York Times ● Mar. 28, 2012

Chopin's four impromptus, often dismissed as salon pieces and rarely played as a group, completed an uncommonly interesting programme.

From The Guardian ● Dec. 3, 2010

Mr. Kissin performs four polonaises and four impromptus with his customary crystalline technique, singing tone and generous rubato.

From New York Times ● May 27, 2010

The salle à manger, as in so many of those inns at Barbizon, Moret, and the other Fontainebleau villages, is panelled and frescoed with humorous and high-spirited impromptus done by visiting painters.

From Pipefuls by Christopher Morley

Related Words

• offhand
• spontaneous
• unscripted