Expressions (phrases, clauses, etc.), I-adjective (keiyoushi)
being unfamiliar with a locality; not knowing one's way around
彼女は森の中で右も左も分からなくなった。She lost her way in the forest. not knowing one's right hand from the left; being clueless
Also written 右も左も分からない【みぎもひだりもわからない】