loneliness
n. 孤独，寂寞
例句
He felt a sudden inexpressible loneliness.
他突然有种难以言喻的孤独感。
《柯林斯英汉双解大词典》
Many deaf people have feelings of isolation and loneliness.
许多失聪的人有孤独和寂寞的感觉。
Loneliness is a high price to pay for independence in your old age.
孤寂是老年独自生活要付出的高昂代价。
《牛津词典》
