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不知好歹

bu4 zhi1 hao3 dai3

• unable to differentiate good from bad (idiom)
• not to know what's good for one
• unable to recognize others' good intentions

不知就里

繁体：不知就裡

bu4 zhi1 jiu4 li3

• unaware of the inner workings
• naive
• unwitting

不知所之

bu4 zhi1 suo3 zhi1

• whereabouts unknown

不知所云

bu4 zhi1 suo3 yun2

• to not know what sb is driving at
• to be unintelligible

不知所以

bu4 zhi1 suo3 yi3

• (idiom) to not know the reason
• (idiom) to not know what to do

不知所措

bu4 zhi1 suo3 cuo4

• not knowing what to do (idiom); at one's wits' end
• embarrassed and at a complete loss

不知所终

繁体：不知所終

bu4 zhi1 suo3 zhong1

• (idiom) to vanish without a trace; to go missing

不知所谓

繁体：不知所謂

bu4 zhi1 suo3 wei4

• nonsense
• nonsensical
• incomprehensible