六神无主
Meaning
Panicked and unable to think clearly; so flustered that one cannot decide what to do.
In a sentence
When the alarm rang, he was 六神无主 and forgot the exit route.
Usage note
A state of agitation, stronger than ordinary nervousness.
Where you see it in Brain Challenge
This idiom appears in the picture-idiom levels as a picture or number clue. When the clue shows numbers, the digits usually become the first characters of each half of the idiom — that is why so many chengyu start with 一, 三, 五, 七, 九 or 十.