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Definitions

impromptu

[im-promp-too, -tyoo] / ɪmˈprɒmp tu, -tyu /
ADJECTIVE
unrehearsed, improvised
Synonyms
STRONGEST
offhand spontaneous unscripted
STRONG
ad-lib fake
WEAK
dashed off extemporaneous extempore extemporized faked improv improviso off the cuff played by ear shot from the hip spur-of-the-moment thrown off tossed off unpremeditated unprepared unstudied vamped whipped up winged
Antonyms
STRONGEST
deliberate planned
ADVERB
unrehearsed, improvised
Synonyms
STRONGEST
offhand spontaneous unscripted
STRONG
ad-lib fake
WEAK
dashed off extemporaneous extempore extemporized faked improv improviso off the cuff played by ear shot from the hip spur-of-the-moment thrown off tossed off unpremeditated unprepared unstudied vamped whipped up winged

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

A few days before the Final Four, they decided to make an impromptu trip to Arizona to cheeron UCLA.

From Los Angeles Times • Apr. 4, 2026

Little stone circles had been laid as impromptu memorials to the men at the site where they died, a little Palestinian flag flapping above one.

From Barron's • Mar. 15, 2026

In September 2022, William made an impromptu call to Harry to suggest they walk out of Windsor Castle together to greet crowds who had gathered to mourn the death of Queen Elizabeth.

From The Wall Street Journal • Mar. 11, 2026

After hearing that the shrine would be taken down, Erin Curran from Northern Ireland has booked an "impromptu" trip before it's gone.

From BBC • Mar. 4, 2026

It’s just Jessie, swooping in for an impromptu FaceTime.

From "What If It's Us" by Becky Albertalli and Adam Silvera

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.