e·the·re·al /iˈTHirēəl/ adjective 1. extremely delicate and light in a way that seems too perfect for this world. "her ethereal beauty" Cassidy knew seventh grade was horrible but she never knew it would end the way it did. Her world fell apart the day her father left that shift, the shift that he wouldn't return home from. Cassidy never thought the world would also come crashing down when hers did. Cassidy also didn't know the trauma that came with the new world, watching friends come and go, she never thought her mother meant it this way. Season 3-8 The Walking Dead season 3-??? Z Nation.