osuđenik

1. convict; convicted person
   Dvojica osuđenika pobegla su iz zatvora. — Two convicts escaped from prison.
   Osuđenik na smrt čekao je presudu višeg suda. — The man on death row was waiting for the higher court's ruling.

The sentence is expressed with na + acc.: osuđenik na doživotnu robiju. When the person is serving a prison sentence, osuđenik can be rendered as "prisoner", but the word itself does not mean "imprisoned".