“Stunning” is a B2 level adjective that is used to describe something (or a person) that is very beautiful or attractive. You can use it in your B2 First exam to describe a place that is very impressive such as the Eiffel Tower in France.
Examiner: “Tell me about a holiday you really enjoyed?”
Candidate: “Last year I went on a trip to Switzerland which was amazing, some of the views from the mountains were absolutely stunning“
She looked (4)…… as she walked down the aisle in her wedding dress.