英和和英

needless to say

I need not say

No comment!

to be unable to speak

I have nothing further to say.

uncertainty

（文頭に置けば）―There is no saying―（文尾に置けば）―for aught one knows―（独立句に用いれば）―Who knows?―God knows―（形容詞に用いれば）―unspeakable sorrow―inexpressible feeling―indescribable beauty―unutterable grief―ineffable joy―indefinable charm―exquisite pleasure

whether one will or not―willy-nilly―without more ado―peremptorily

It does not justify repetition, but...

the state of being idle

Can't say anything

I have left nothing unsaid―said everything.

not inquiring

to say nay―deny―refuse

I need scarcely say.

a word or words the utterance of which is forbidden

There is no way of expressing it―It is unspeakable―unutterable.

the state of being impossible to fully express in words

It is beyond recall―past recall.

something that is trivial or unworthy of attention

It's not an exaggeration

not certain; doubtful

te condition of being unsteady

I am not certain [sure].

be idle

Fail to become...

The rest needs no telling.

to stand idly by

The statement is too sweeping.

Haven't done it