不当 búdàng unsuitable
unsuitable; improper; inappropriate
How to remember 不当: 不 not + 当 act as = unsuitable.
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How it is used
- 'Improper, inappropriate', attributive - 处理不当 (chǔlǐ búdàng) mishandled, 用词不当 (yòngcí búdàng) inappropriate wording.
- Formal; note the reading dàng (= appropriate), not dāng.