言いうまでもない

expression, i-adjective

goes without saying; needless to say; obvious

Used to state that something is so obvious or well-known that it doesn't need to be mentioned. Often appears as a sentence-ending phrase or as a modifier before こと/もの.

• 安あん全ぜんが第だい一いちであることは言いうまでもない。

  It goes without saying that safety comes first.

• 彼かれが優ゆう秀しゅうなのは言いうまでもないことだ。

  That he is excellent is obvious.