HSK 7-9
孤单
gūdān形
lone; lonely; loneliness
他独自在外难免感到孤单。
Tā dú zì zài wài nán miǎn gǎn dào gū dān.
Living away alone, he inevitably feels lonely.
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Appears across levels (7-9) in the HSK 3.0 word list.