s. marked by dejection from being alone
s. devoid of creatures
a. 孤单的, 孤寂的, 荒凉的
1. I often feel lonely when I'm away from my friends.
当我离开朋友时，我常常感到孤独。
2. She spends her weekends alone, which makes her feel lonely.
她一个人度过周末，这让她感到孤独。
3. It's normal to feel lonely sometimes, but there are ways to connect with others.
有时感到孤独是正常的，但有很多方法可以与他人建立联系。