unrehearsed

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

From un- + rehearsed.

The orchestra, unnerved by this unrehearsed infusion of new business, had stopped playing. — The Man with Two Left Feet, and Other Stories, P. G. (Pelham Grenville) Wodehouse
No procession was arranged by those responsible for the entertainment, but the habit of punctuality instilled by the Great little Beau secured an unrehearsed pageant. — The Passionate Elopement, Compton MacKenzie
In the white glare, pretty girls in doorways looked like actresses in a costume play, waiting in the wings to “go on.” But no yells of a stage mob ever were so realistic as those of the unrehearsed band who howled over my poor Gloria as she deposited her passengers at the fonda; and Ropes and I pushed her through a wall of human beings to a stable-garage, where her flywheel gushed a protest of fiery sparks on the high stone step of entrance. — The Car of Destiny, C. N. (Charles Norris) Williamson

ad-lib, extemporaneous, extemporary, extempore, impromptu, offhand, offhanded, off-the-cuff

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