海うみの物ものとも山やまの物ものとも判わからない

expression, i-adjective

neither fish nor fowl; hard to predict; uncertain nature

Used when something is so ambiguous or unclear that you cannot tell what it is, what it will become, or which category it belongs to. Often appears in negative or uncertain contexts.

• 彼かれの提てい案あんは海うみの物ものとも山やまの物ものとも判わからない内ない容ようだった。

  His proposal was so vague that it was hard to tell what it really was.