Unpublished (adjective)

1. Not having been published or made generally known.
2. Not having appeared in a printed or online publication.

Origin:

Late 17th century: from un-1 (expressing negation) + published, past participle of publish.

Examples:

1. His first novel remained unpublished until after his death.
2. The unpublished manuscript was discovered in the author's attic.
3. The unpublished research findings were groundbreaking.
4. The unpublished data were considered highly confidential.
5. The unpublished book was a best-seller after it was finally released.