言うでもない;-は言うまでなく,-も
Usage
This phrase is used when the speaker mentions something obvious or something assumed to be known to the hearer. It is commonly used in written language. Needless to say; It goes without saying that; It is obvious that -;
Examples
明日の試験では、言うまでもなく、文法の問題が出ます。
The test tomorrow, it is obvious that there will be questions related to grammar.
図書館では静かにしなくてはいけないことは、言うまでもない。
It goes without saying that inside of the library that being quiet is necessary.