言いわでも

expression

goes without saying; needless to say

Used when something is so obvious that it doesn't need to be stated. Often interchangeable with 言わずもがな.

See also: 言わずもがな

• 言いわでも分わかることだ。

  That's something that goes without saying.

expression

better left unsaid

Implies that mentioning something would be inappropriate or cause trouble; it's better to keep quiet.

• そのことは言いわでもいいことだ。

  That's something better left unsaid.