Literal translation:
* Princesse perdue: This is the most straightforward translation. It literally means "lost princess."
More nuanced options:
* Princesse disparue: This translates to "disappeared princess" and implies a more mysterious or dramatic disappearance.
* Princesse égarée: This means "lost princess" but emphasizes the feeling of being lost or misplaced, perhaps through a journey or a change in circumstance.
* Princesse oubliée: This translates to "forgotten princess" and suggests a princess who has been overlooked or forgotten by time.
The best choice will depend on the specific context of your sentence or story.