Unlined (adjective)

1. Not having a lining, especially a protective or decorative one.
2. Not having markings or boundaries to distinguish one area from another.

Origin:

Unlined is an adjective form of the word 'line', which means to cover or decorate with a line or lines.

Examples:

1. She wore an unlined coat to keep her warm in winter.
2. The walls of the room were unlined and blank.
3. The unlined note-book is perfect for the artist who wants to sketch freely.
4. The beach was unlined and the waves crashed against the shore.
5. The menu was unlined, indicating a lack of options.