言いわずもがな

expression

goes without saying; needless to say

Used to state that something is so obvious it doesn't need to be mentioned. Often appears as a sentence-initial or parenthetical phrase.

• 言いわずもがな、健けん康こうが一いち番ばん大たい切せつだ。

  It goes without saying that health is the most important thing.

• 言いわずもがなのことだが、遅ち刻こくは厳げん禁きんだ。

  Needless to say, being late is strictly forbidden.

expression, noun which may take the genitive case particle 'no'

better left unsaid; shouldn't be said

Used to indicate that something is better not mentioned, often because it is tactless, unnecessary, or might cause trouble. Can modify a noun with の.

• 彼かれの失しっ敗ぱいについては言いわずもがなだ。

  It's better not to mention his mistake.

• それは言いわずもがなの注ちゅう意いだった。

  That was a piece of advice better left unsaid.