a feeling of being unhappy because you have no friends or people to talk to 孤独的；寂寞的 a period of loneliness in his life 他一生中孤苦伶仃的一段时间 feelings of loneliness and depression 孤独和沮丧的感觉
the fact of a period of time being sad and spent alone the loneliness of all those evenings at home just watching TV 那些晚上在家看电视的寂寞
the fact that very few people ever visit a place the desolation and loneliness of the island 岛上的荒凉与寂寞