形容詞 lonesome:

1. being the only one; single and isolated from others
   同義詞：lone, only, sole, solitary
2. marked by dejection from being alone
   同義詞：lonely

1. He was lonesome for a friend.
   他孤獨，急需找到一位朋友。
2. He felt lonesome at home alone.
   他一個人呆在家里感到寂寞。
3. He spent a lonesome evening at home.
   他在家里度過了一個寂寞的夜晚。

lone.some

adj.（形容詞）

Dejected because of a lack of companionship.See Synonyms at alone
寂寞的：由于缺少伙伴而沮喪的參見 alone
Producing such dejection:
引起這種沮喪的：
例句：
a lonesome hour at the bar.
酒吧里一段孤寂的時光

Deserted; unfrequented:
荒涼的；人跡罕至的：
例句：
a lonesome valley.
荒涼的山谷

Solitary; lone:
孤單的；只有一個的：
例句：
a lonesome pine.
孤單的一棵松樹

n.Informal （名詞）【非正式用語】
Self:
自己：
例句：
He ate the meal all by his lonesome.
他獨自一人吃了飯

【引伸】
lone.somely
adv.（副詞）
lone.someness
n.（名詞）