Unannounced

The salesman arrived unannounced at their doorstep.

The unannounced visit from her parents surprised her.

The students were caught off guard by an unannounced pop quiz.

The movie premiere had an unannounced celebrity guest.

The mayor made an unannounced visit to the local hospital.

The band decided to release an unannounced album on their website.

The teacher announced an unannounced field trip for the class.

The neighbors had an unannounced barbecue party in their backyard.

The sudden and unannounced thunderstorm caught everyone off guard.

The celebrity made an unannounced visit to the hospital to meet with the patients.

The company CEO made an unannounced inspection of the factory to ensure everything was running smoothly.

The government announced an unannounced crackdown on illegal drugs.

The superstar made an unannounced appearance at the charity event.

The company decided to make an unannounced visit to the branch office.

The soldiers conducted an unannounced inspection of the barracks.

The mayor made an unannounced visit to the local hospital to meet with patients.

The company made an unannounced decision to downsize its workforce.