摸不著頭腦

Simplified: 摸不着头脑

mōbuzháotóunǎo ㄇㄛ ˙ㄅㄨ ㄓㄠˊ ㄊㄡˊ ㄋㄠˇ

    • to be unable to make any sense of the matter
    • to be at a loss

Character by character

Sources