[いうまでもない(P);ゆうまでもない, iumademonai (P); yuumademonai] (exp) it goes without saying; there is no need to say so, but of course; it is needless to say; it need scarcely be said; (P)
[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
[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