unerasable (adjective)

1. According to Greek mythology, the curse placed on Tantalus was unerasable, resulting in eternal punishment.

2. In the science fiction novel, the protagonist discovers an unerasable mark on their body that signifies their connection to an alien species.

3. The plot twist in the movie revealed an unerasable secret that changed the course of the characters' lives.

4. The graffiti on the walls of the ancient building remained unerasable, serving as a reminder of past cultural movement.