mope around (verb)

1. As night fell, the restless ghost moped around the haunted mansion, searching for its lost soul.

2. The melancholic protagonist moped around the city streets, reflecting on their tragic past.

3. Why did the depressed lemon mope around? Because it couldn't find its zest for life!

4. In a futuristic world, the humanoid robot mopes around the abandoned city, pondering the mystery of its existence.