推すい測そくの域いきを出でない

expression

only speculation; just guesswork; a matter for conjecture

Used when something cannot be confirmed and remains within the realm of speculation. Often appears in formal or analytical contexts.

• その原げん因いんについては、まだ推すい測そくの域いきを出でない。

  The cause is still only speculation.

• 彼かれの動どう機きは推すい測そくの域いきを出でないが、金きん銭せん的てきな問もん題だいがあったのかもしれない。

  His motive is just guesswork, but there may have been financial problems.