HSK 7-9
沉闷
chénmèn形
oppressive (of weather); heavy; depressed; not happy
会场气氛显得有些沉闷。
Huì chǎng qì fēn xiǎn de yǒu xiē chén mèn.
The atmosphere in the meeting hall felt somewhat oppressive.
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Appears across levels (7-9) in the HSK 3.0 word list.