Unknowingly

The hikers unknowingly ventured off the marked trail and got lost.

The driver unknowingly ran a red light and got a ticket.

The customer unknowingly paid too much for the item due to a pricing error.

She unknowingly booked a flight for the wrong date.

He unknowingly used the wrong chemical in the experiment.

The student unknowingly plagiarized a section of her paper.

The actor unknowingly wore the same outfit as his co-star to the event.