Scribbler (noun)

1. A person who writes quickly and carelessly.
2. A person who writes, especially a writer of little merit.

Origin:

From the verb scribble, which means to write quickly and carelessly.

Examples:

1. He was dismissed as a mere scribbler by the literary establishment.
2. The notebook was filled with the scribbler's musings and doodles.
3. He was called a scribbler by his critics.
4. She was considered a scribbler by the critics but her work is still read today.
5. The diary was filled with the scribbler's thoughts and observations.