unannounced

The truck will travel to a different unannounced location every night at dusk.

You come in here unannounced; I don't know how nor from where.

Unannounced, he strode into the drawing-room, threw himself into an easy-chair, and asked for a glass of iced water.

It was evening when Terrence reached the town unannounced and unheralded with his right arm in a sling.

In every other case He came unannounced and unexpected; but for this meeting there had been a distinct and definite appointment.

Unexpected and unannounced, he strode in to the pickle foundry and grasped the fat arm of the girl who worked next to Warble.