不慎 búshèn incautious
incautious; inattentive
How to remember 不慎: 不 not + 慎 cautious = incautious.
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How it is used
- Formal adverb 'carelessly, inadvertently' - 不慎跌倒 (búshèn diēdǎo) accidentally fell, 不慎丢失 (búshèn diūshī) lost through carelessness.
- Written register; more formal than 不小心.