Unlabeled (adjective)

1. Not having a label or tag attached to it.
2. Not having been assigned or identified with a particular name, designation, or category.

Origin:

Derived from the word 'label' meaning a descriptive tag or name attached to an item.

Examples:

1. The unidentified bottle was unlabeled and its contents were unknown.
2. The unmarked roads in the wilderness were unlabeled and hard to navigate.
3. The anonymous painting was unlabeled, leaving its artist a mystery.
4. The unmarked graves were unlabeled and their stories untold.
5. The unclassified documents were unlabeled and their contents secret.