He trudged home feeling lonely and let down.

　　他步履艱難地往家走，感到孤獨而沮喪。

　　She felt lonely and hopeless.

　　她感到孤獨絕望。

　　I don't get lonely now because I make the effort to see people.

　　我現在不覺得孤獨了，因為我嘗試著與人交往。

　　They often have a lonely and solitary life to lead.

　　他們常常過一種獨居的孤獨生活。

　　I would imagine she's quite lonely living on her own.

　　我猜想她一個人過肯定很孤獨。