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Longman Dictionary of Contemporary English
an unannounced visit (=one that someone makes without first telling the person that they are going to visit)
▪ The social worker made an unannounced visit.
arrive unannounced (=without anyone expecting or knowing you were coming)
▪ He arrived unannounced yesterday and stayed the night.
▪ an unannounced visit
▪ Investigators from the health department made unannounced visits to the hospital in March.
▪ My brother is famous for showing up at our houses unannounced, usually around dinner time.
Douglas Harper's Etymology Dictionary

1775, from un- (1) "not" + past participle of announce (v.).


a. Not announced


adj. without warning or announcement; "they arrived unannounced"; "a totally unheralded telegram that his daughter...died last night"- M.A.D.Howe [syn: unheralded, unpredicted]

Usage examples of "unannounced".

And even the private schools, traditionally viewed with suspicious dislike by state education officials, were hit by surprise inspections so seldom that the very act of an accreditation team, showing up unannounced at one of them, was tantamount to an accusation of educational hanky-panky.

Until this latest visit, when Lo Manto had walked into his bar unannounced less than a week ago and sliced off a piece of his ear.

Provost-Marshal Shappi about which revs and reps to use in this Bullball match, which I take it you interupted, when a rating entered my office unannounced.

Lauderdale slithered unannounced and unadmitted into the chapel at ten after nine, I was more than a bit surprised.

Her mother had walked into the kitchen, uninvited and unannounced, and was regarding each of them in turn with her nose lifted in the air.

It was understood that the Captain would not harass them in their bunks by unannounced inspections.

Acorna had in mind to go unannounced and unescorted, except by Pal, and pointed out that bringing a large group would almost certainly cause the supervisor of the glassworks to treat their visit like an official inspection, hiding all the children.

He came to call on us at our hotel--a rare honour for a stranger with these haughty and exclusive Tyrolese nobles--and even entered unannounced in the most friendly manner.

Inspections were carried out unannounced and if querns or food were found hidden, the entire family would be put to death.

Dreams, though, still needed her, swooping in at any hour, unannounced, sometimes unrecognized, deep into the intricate urgency of the passing moment she could be startled awake by the sudden evaporation of objects, happenings, truths, her surroundings deftly replaced by another set whose reality might or might not be so permanent.

Or the busload of Korean tourists who pulled up unannounced one busy night, got married en masse, then couldn't stop joking about doing it all over again, as if the Vegas chapel experience were a variety of amusement park ride.

Unannounced by heraldic symbolism but unconcealable by reason of nature's own blazonry, were several citizens and citizenesses of the great republic of the Western world.

The cliche Latin temperament leaped into Marissa's mind as she looked at the group that had apparently arrived unannounced.

It wasn't what Ty said but the things he didn't say, and the flatness in his voice and eyes, and the lack of any reference to Tara, that clued Chase in to the reason Ty had arrived unannounced.

Since his absence had been unannounced, it was supposed that he had retired to the underground adyta below the pyramid of the Voorqual for purposes of prolonged meditation, as was sometimes his wont.