The Chinese word 孤单 is formed by merging two characters, 孤 and 单, both of which independently convey ideas of solitude and being alone. 孤 suggests a state of isolation or orphanhood, while 单 emphasizes singleness or simplicity. When combined, these characters reinforce each other to create a unified concept that captures a profound sense of loneliness, where the absence of companionship or connection is emphasized through their shared thematic essence.