Noun which may take the genitive case particle 'no', Noun
totally at a loss; lose one's bearings; in a maze; in a fog; all at sea; up in the air; mystified; bewildered
Yojijukugo (four character compound)
これからどう会社を経営していったらいいのか、五里霧中だ。We're all at sea about where to take our company from here.
Also written 五里夢中【ごりむちゅう】