- 不知所措 [bù zhī suǒ cuò]
- be at a loss what to do; be at [come to] one's wits' end; be at a nonplus; be at a stand; lose one's bearings; not to know what to do; not to know whether one stands on one's head or heels; not to know what to make of; push [press; hit] the panic button; scarcely know where to turn
He felt completely at sea in his new school.
I've been in a complete daze since hearing the sad news.
I was dazed by her sudden offer.