zatečen

1. (of a person) taken aback; caught off guard
   Bio sam potpuno zatečen njegovim pitanjem. — I was completely taken aback by his question.
   Zatečena, nije znala šta da kaže. — Caught off guard, she didn't know what to say.
2. (in a place or act) caught; found
   Lopov je zatečen u krađi u prodavnici. — The thief was caught stealing in the shop.
3. (of a situation, problems) existing, pre-existing, found on arrival
   Nova vlada mora da reši zatečene probleme. — The new government has to solve the problems it inherited.
   Inspektor je zapisnikom utvrdio zatečeno stanje. — The inspector recorded the existing state of affairs in the report.

The cause of surprise is usually in the instrumental: zatečen vešću.