Unnamed (adjective)

1. Not having a name or being known by a particular name.
2. Not having been referred to or specified by name.

Origin:

Late 16th century; un- + named.

Examples:

1. The unnamed source provided the information.
2. The unnamed river flows through the valley.
3. The unnamed suspect was seen leaving the area.
4. The unnamed witness is afraid to testify.
5. The unnamed soldier was honored for his bravery.