unopened (adjective)

1. In Greek mythology, Pandora's box remained unopened until curiosity overcame her.

2. The unopened letter found in the attic held a secret that changed the course of the protagonist's life.

3. The unopened door at the end of the hallway filled the character with a sense of foreboding.

4. The protagonist stumbled upon an unopened package that contained a mysterious artifact in the latest anime episode.