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.
安全が第一であることは言うまでもない。
It goes without saying that safety comes first.
彼が優秀なのは言うまでもないことだ。
That he is excellent is obvious.