知しる由よしもない

expression, i-adjective

have no way of knowing; be completely ignorant of

Fixed expression meaning there is no means or way to know something. Often used when the speaker has no access to information.

• 彼かれが今いまどこにいるか、知しる由よしもない。

  I have no way of knowing where he is now.

• その話はなしが本ほん当とうかどうか、私わたしには知しる由よしもなかった。

  I had no way of knowing whether that story was true.