丈二和尚，摸不着头脑
zhàng'èr​hé​shang​mō​bu​zháo​tóu​nǎo

at a total loss

丈二和尚，摸不着头脑 丈二和尚，摸不著頭腦 zhàng'èr​hé​shang​mō​bu​zháo​tóu​nǎo
at a total loss
To be completely baffled or unable to make head or tail of a situation; literally describes being unable to touch the head of a monk who is two 丈 zhàng (about 6.6 meters) tall.

Cross-References

See