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Longman Dictionary of Contemporary English
unscheduled
adjective
EXAMPLES FROM OTHER ENTRIES
▪ Bad weather forced the pilots to make an unscheduled landing.
EXAMPLES FROM CORPUS
▪ A slip-up now and an extra, unscheduled recording break will be necessary.
▪ As the southbound train hit the New Hampshire-Maine border, it made an unscheduled stop.
▪ During follow-up, adverse events were looked for systematically at all scheduled and unscheduled visits.
▪ Food product quality is more easily maintained thereby reducing spoilage losses and production time through unscheduled cleaning.
▪ In 15 of those flights, pilots were forced to make unscheduled landings.
▪ In the handover to Jan Lammers, another new battery was fitted, and then another in an unscheduled stop.
▪ Seven times the aircraft made unscheduled landings.
Wiktionary
unscheduled

a. Not scheduled; impromptu

WordNet
unscheduled

adj. not scheduled or not on a regular schedule; "an unscheduled meeting"; "the plane made an unscheduled stop at Gander for refueling" [ant: scheduled]

Usage examples of "unscheduled".

Matt straps in alongside the others, in cannibalized, bolted-down seats that were originally designed for minor jolts and unscheduled burns in free-fall maneuvering.

By chance my patrol was making an unscheduled stop at Sol, and we detected them by radar and followed them here just in time to destroy them.

And then that cursed Antarian captain had to make an unscheduled visit to Sol.

Philobosian smelled like an old couch, of hair oil and spilled soup, of unscheduled naps.

London, and I, mindful of earlier unscheduled destinations after racing, took myself circumspectly down the road to the nearest public telephone box.

SkyLight had always had a bad tendency to change perfectly good plans for no better reason than what seemed to be the unscheduled whims of the people at boardroom level.

I found myself making an unscheduled turn into a small public garden, where Oliver abruptly left me beside the first seat we came to and walked jerkily away.

We always clear with the switchboard when making up the bill, especially on unscheduled checkouts, and we have no record of it.

But it was noted that the unearthly canine choruses that had been plaguing Wilmington ended with that unscheduled concert.

But under the Grand Central gate listing was a small red box that said in boldface type, Claudication temporarily dislocated due to unscheduled sdatial interruption, followed by a string of numbers and symbols in the Speech, a description of the gate's new location.

Besides, little colonies like this don't get visits from unscheduled merchants.

The Party, the Federal Security Bureau, and the European Peoples' Army were maneuvering against each other in an unprecedentedly overt manner: military budgets queried, more MEPs and Party officials under suspicion or arrest, inquiries launched into FSB illegalities, rapid promotions and demotions and cashierings, military exercises proceeding without authorization, unscheduled call-ups of reservists (which, I guessed, added draft-evasion to my crimes).

It had been something of an effort for him to get an unscheduled meeting with Stearns, as the increasing pressure on the office of the Prime Minister of the United States of Europe was filling the man's day from end to end and frequently had him burning the midnight oil.

In case my loudmouthed friend decides to cut up rough about the unscheduled stop again.

He was oblivious to the unscheduled fierce snowstorm that was raging outside the building, and when the priority override interrupted his data link with news of the Mariana Monsters (the press’.