HSK 7-9
不解
bùjiě动
to not understand; to be puzzled by; indissoluble
大家对他的突然离开很不解。
Dà jiā duì tā de tū rán lí kāi hěn bù jiě.
Everyone was puzzled by his sudden departure.
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Appears across levels (7-9) in the HSK 3.0 word list.