verb (used with object), an·nounced, an·nounc·ing.
verb (used without object), an·nounced, an·nounc·ing.
Origin of announce
Examples from the Web for unannounced
In terms of unannounced drills “there is really very little research out there to guide us in this area.”
Nickerson points out this does not apply to unannounced drills.
Barnes supplies no explanation or justification for its unusual construction, for the unannounced swerve from fact to fiction.‘One Relishes the Pain’: Julian Barnes’ Memoir of Grief|Adam Begley|September 25, 2013|DAILY BEAST
She acknowledges that after the 2010 incident there was a de facto and unannounced freeze in building inside East Jerusalem.Israel Quietly Freezes Construction Through Barack Obama’s Visit|Eli Lake|March 18, 2013|DAILY BEAST
Betty finally had to let her nanny go for good when she repeated her behavior a year later, leaving for six weeks unannounced.The Stranger Inside Your House: Terrified by the Alleged Killer Nanny|Paula Froelich|October 26, 2012|DAILY BEAST
There was no one about when he arrived, and he strode indoors, unannounced.The Scarlet Feather|Houghton Townley
It was late and almost quite dark when, unannounced, he entered the drawing-room from the lawn by an open French window.Dilemmas of Pride, (Vol 2 of 3)|Margracia Loudon
They used to bounce in unannounced and eat up all our peanut butter.Polly's Senior Year at Boarding School|Dorothy Whitehill
He appears before us unannounced as "Elijah the Tishbite of the inhabitants of Gilead."The Expositor's Bible: The First Book of Kings|F. W. Farrar
The time selected by the free and easy knight for his unannounced visitation of Montgomery was Sunday at dinner time.Heads and Tales|Various
Word Origin for announce
c.1500, "proclaim, make known," from Old French anoncier "announce, proclaim" (12c., Modern French annoncer), from Latin annuntiare, adnuntiare "to announce, relate," literally "to bring news," from ad- "to" (see ad-) + nuntiare "relate, report," from nuntius "messenger" (see nuncio). Related: Announced; announcing.