HSK 7-9
不知所措
bùzhī-suǒcuònot knowing what to do (idiom); at one's wits' end; embarrassed and at a complete loss
突发情况让新人不知所措。
Tū fā qíng kuàng ràng xīn rén bù zhī suǒ cuò.
The sudden situation left the newcomer at a complete loss.
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Appears across levels (7-9) in the HSK 3.0 word list.