forlorn

他孤寂的创业计划最终失败了。

His ___forlorn business venture ended in failure.

那只被遗弃的小狗站在雨中，看起来非常孤独可怜。

The abandoned puppy stood in the rain, looking utterly ___forlorn.

他坐在空荡荡的房间里，脸上露出孤寂的神情。

He sat in the empty room with a ___forlorn expression on his face.