HSK 7-9
不当
búdàng形
unsuitable; improper; inappropriate
使用不当可能损坏机器。
Shǐ yòng bú dàng kě néng sǔn huài jī qì.
Improper use may damage the machine.
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Other HSK words sharing a character
Also free:
Appears across levels (7-9) in the HSK 3.0 word list.