The phrase "at unannounced" is not correct in English.
You might be trying to convey the idea of something happening without prior notice.
Example: "The meeting was scheduled at unannounced times, making it difficult for everyone to attend."
Alternatives: "without notice" or "unexpectedly".
State officials said similar searches would take place in the future at unannounced times and places.
Here's another way that practically guarantees that employees will perform their tasks in a timely way: At unannounced times, a manager should recognize a worthy employee with a prize.
But it drew the line at unannounced inspections of Mr. Hussein's presidential palaces, saying it would adhere to an existing agreement with the United Nations that makes it all but impossible for the inspectors to adequately scrutinize them.
"Yeah, yeah, yeah, I'm the last civilian manning a lighthouse in the country; so what?" Mr. Schubert says on his porch on a beautiful windswept afternoon, a tanker moving past the property and up the harbor while his companion Blaze, an overweight cocker spaniel, snarls at unannounced visitors.
In her first visit to the key presidential primary state since her 2008 campaign for the White House, the former US secretary of state also stoked speculation that she is readying another run in 2016, meeting voters at unannounced campaign stops.
It will ship with Ice Cream Sandwich sometime in the second quarter for at unannounced price points.
A sobriety checkpoint is usually operated at night at an unannounced location.
At an unannounced scanning at Murray Bergtraum High School in Manhattan in December 2010, police confiscated a reported 500 cell phones, but no dangerous weapons.
He will appear at the Tabernacle unannounced at any time of the day, any day of the week, as the spirit moves him.
As an assiduous self-publicist, he once appeared at BBC Radio Leicester unannounced, demanding to be interviewed.
