adjective describing something that is not announced or made known beforehand
Troops were deployed on an unannounced mission.
The CEO made an unannounced visit to the company's headquarters.
Teachers may make unannounced visits to classrooms to observe teaching practices.
Patients may receive unannounced visits from home health aides.
Hotel guests may receive unannounced room inspections.
Undercover agents conducted unannounced surveillance on the suspect.
In the publishing industry, a writer may receive an unannounced visit from a literary agent or editor interested in their work.
A psychologist may conduct unannounced visits to check on the well-being of their clients or to observe their behavior in a natural setting.
In software development, an unannounced code review may be conducted to ensure quality and adherence to coding standards.
Retail managers may perform unannounced store visits to assess customer service, cleanliness, and overall operations.
An auditor may conduct unannounced audits to verify financial records and ensure compliance with regulations.