孤零零 (gū líng líng): lone; isolated and without help; all alone; solitary

That little dog was crouching alone in the rain at the doorway, soaked through, looking very pitiful.

The children all went off to university, and she lives alone in the old house, often feeling lonely.

In the late-night train station, he sat alone on a bench waiting for the train, with not a single person around.

In the forest there was a lone old tree; without any other trees beside it, it stood out especially.

After moving to the big city, he often took lonely walks in the park on weekends, missing his friends back home.