You “look” lost.
People can easily tell how you feel about something judging by your facial expression. Therefore, “脸 (liǎn): face” can serve as an indicator of your mood. So how to say “Feel Completely Lost” In Chinese?
Say “Feel Completely Lost” In Chinese: 一脸懵逼 (yī liǎn mēng bī)
脸 (liǎn): face
懵 (mēng): to feel lost
Put together, 一脸懵逼 (yī liǎn mēng bī) literally means one’s face is full of the expression of feeling lost.
We use it to describe a person who is feeling completely lost and doesn’t know what to say.