| 孤独HSK 6 | gū dú | lonely; solitary | |
| 孤立HSK 6 | gū lì | isolate; isolated | |
| 孤儿 | gū ér | orphan | |
| 孤寂 | gū jì | lonesome; desolate | |
| 孤单 | gū dān | lone; lonely; loneliness |
| 1 | Sometimes I feel lonely. | |
| 2 | He is easy to feel lonely. | |
| 3 | Lonely people need companionship. | |
| 4 | Loneliness doesn't necessarily mean solitude. | |
| 5 | They decided to adopt an orphan. |