言わずもがな

Meaning

1. exp
   (it) goes without saying; needn't be said
2. expadj-no
   that should rather be left unsaid

Example sentences

• 言わずもがなのことを言ってしまった。

  I should not have said that.

• 言わずもがなだ。

  You know what it is.

• そんなことは言わずもがなだ。

  That goes without saying.