HSK 7-9
茫然
mángrán形
blankly; vacantly; at a loss
面对突然提问，他一脸茫然。
Miànduì tūrán tíwèn, tā yìliǎnmángrán.
He looked completely lost when faced with the sudden question.
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Appears across levels (7-9) in the HSK 3.0 word list.