loneliness的形容词形式是？

He trudged home feeling lonely and let down.

他步履艰难地往家走，感到孤独而沮丧。

She felt lonely and hopeless.

她感到孤独绝望。

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

我现在不觉得孤独了，因为我尝试着与人交往。

They often have a lonely and solitary life to lead.

他们常常过一种独居的孤独生活。

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

我猜想她一个人过肯定很孤独。