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不知所踪

繁体：不知所蹤

bu4 zhi1 suo3 zong1

• to vanish without a trace; to go missing

不知死活

bu4 zhi1 si3 huo2

• to act recklessly (idiom)

不知疲倦

bu4 zhi1 pi2 juan4

• untiring
• not recognizing tiredness

不知痛痒

繁体：不知痛癢

bu4 zhi1 tong4 yang3

• numb
• unfeeling
• indifferent

不知羞耻

繁体：不知羞恥

bu4 zhi1 xiu1 chi3

• to have no sense of shame
• brazen

不知者不罪

bu4 zhi1 zhe3 bu4 zui4

• One who does not know is not guilty
• If one does not know any better, one cannot be held responsible

不知轻重

繁体：不知輕重

bu4 zhi1 qing1 zhong4

• lit. not knowing what's important (idiom); no appreciation of the gravity of things
• naive
• doesn't know who's who

不知进退

繁体：不知進退

bu4 zhi1 jin4 tui4

• not knowing when to come or leave (idiom); with no sense of propriety