completely at a loss; bewildered and not knowing what to do

to feel lost or dazed as if one has lost something; to be in a daze or a state of reverie

describes being in a daze, utterly ignorant, or in the dark about a situation

bewildered and dazed, as if having lost something; in a trance

To be entirely ignorant of something or to have no knowledge of a situation.

to have a face full of confusion; puzzled or at a loss