• WordNet 3.6
    • adj impromptu with little or no preparation or forethought "his ad-lib comments showed poor judgment","an extemporaneous piano recital","an extemporary lecture","an extempore skit","an impromptu speech","offhand excuses","trying to sound offhanded and reassuring","an off-the-cuff toast","a few unrehearsed comments"
    • adv impromptu without advance preparation "he spoke ad lib"
    • n impromptu an extemporaneous speech or remark "a witty impromptu must not sound premeditated"
    • n impromptu a short musical passage that seems to have been made spontaneously without advance preparation
    • ***
Webster's Revised Unabridged Dictionary
    • Impromptu (Mus) A piece composed or played at first thought; a composition in the style of an extempore piece.
    • adv. or a Impromptu Offhand; without previous study; extemporaneous; extempore; as, an impromptu verse.
    • Impromptu Something made or done offhand, at the moment, or without previous study; an extemporaneous composition, address, or remark.
    • ***
Century Dictionary and Cyclopedia
    • impromptu Offhand; without previous study or preparation: as, a verse written impromptu.
    • impromptu Prompt; offhand; extempore; extemporized for the occasion: as, an impromptu epigram.
    • n impromptu Something said or written, played, etc., at the moment, or without previous study or preparation; an extemporaneous composition or performance.
    • n impromptu In music: An extemporized composition; an improvisation.
    • n impromptu A composition in irregular form, as if extemporized; a fantasia.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Impromptu im-promp′tū prompt, ready: off-hand
    • adv Impromptu readily
    • n Impromptu a short witty saying expressed at the moment: any composition produced at the moment
    • ***


  • Winston Churchill
    “I'm just preparing my impromptu remarks.”
  • Mark Twain
    “It usually takes more than three weeks to prepare a good impromptu speech.”


Webster's Revised Unabridged Dictionary
F. impromptu, fr. L. in promptu, in readiness, at hand; in, in + promptus, visibility, readiness, from promptus, visible, ready. See Prompt


In literature:

Only, as Piero de' Medici is to be there, the choice spirits may happen to be swamped in the capping of impromptu verses.
"Romola" by George Eliot
The speeches were impromptu; the characters and roles were stereotyped.
"Folkways" by William Graham Sumner
They are in the midst of this impromptu picnic when Grandon looks in the doorway, and laughs with the light heart of a boy.
"Floyd Grandon's Honor" by Amanda Minnie Douglas
Such an effect as that could never have been produced except impromptu.
"The Green Carnation" by Robert Smythe Hichens
If the proper person has been chosen for Justice a great deal of fun may be caused by the impromptu imposition of ridiculous penalties.
"Games For All Occasions" by Mary E. Blain
The composition sometimes is spoken of as the "Trilby" impromptu.
"The Pianolist" by Gustav Kobbé
On the evening of Friday, the closing day, Roble gave an impromptu dance.
"Stanford Stories" by Charles K. Field
When the service was over, she made a little impromptu address to the students.
"Molly Brown's Senior Days" by Nell Speed
There were present only the men of Sally's impromptu week-end party.
"The Last Woman" by Ross Beeckman
Besides, some girls can do rehearsed acting well, and are no good at impromptu things, and vice versa.
"A Patriotic Schoolgirl" by Angela Brazil

In poetry:

It doesn’t hurt you much—the thing
Is hardly novel to your life;
And, sans the feast and marriage ring,
You make a good impromptu wife.
"Black Lizzie" by Henry Kendall

In news:

After the Talent Show at the park on the 4th of July the first activity sponsored by the newly formed community theatre - an impromptu dance routine to patriotic songs - took place much to the surprise of the audience.
Miles Austin's impromptu leapfrog over Roy Williams in the end zone was really cool, but the uptight NFL rules committee just can't stand for players to have a good time.
I believe these conditions are used to create an impromptu speed trap.
This week I surprise Sanchez, Chaz, and Michael with a little impromptu reading of Fifty Shades of Grey.
The comments about Katmandu are a sobering look at how the Nepalese live: no zoning or regulation of building, with impromptu construction projects, garbage and more everywhere.
Vice President Joe Biden greets supporters during an impromptu campaign stop Wednesday at the River City Grill restaurant in Radford.
The teachers, Marilyn Pond of Shirley and Lori Rooney of South Side assisted their students in impromptu nutrition presentations before the group.
An impromptu early evening barbecue in a backyard on the Mesa last Friday proved the perfect pairing for a slate of eight wines that had recently been submitted to The Santa Barbara Independent for review.
Impromptu Key West: Here's looking at you, kid.
Decorating expert Phoebe Howard brings back happy hour by creating an impromptu bar that's fit for Don Draper.
For impromptu picnics , stop by the on-site Pavilion Café for provisions.
Pack up Pongo for impromptu paddle challenges.
I had pistachio cake for the first time on St Patrick's Day 13 years ago when a coworker made it for an impromptu celebration.
Wurzelbacher became a media star after a chance encounter with Obama Oct 12 during an impromptu campaign stop the Democratic presidential nominee made in the plumber 's middle class suburban neighborhood.
Outdistancing my fellow editors in an impromptu fuel economy challenge.

In science:

In particular the solutions with nonzero G+ have been missed hitherto in a usual impromptu approach.
Black hole solutions in string theory
The session was rounded out by impromptu tributes from R.
Matters of Gravity, the newsletter of the APS TG on gravitation