[いわずもがなのこと, iwazumogananokoto](exp, n) (1) something that goes without saying; something that needn't be said; (2) something that should rather be left unsaid[Add to Longdo]
[いわでものこと, iwademonokoto](exp, n) (1) something that goes without saying; something that needn't be said; (2) something that should rather be left unsaid[Add to Longdo]