英和和英

I am dumfounded―I am struck dumb with astonishment―astonishment deprives me of my power of speech.

to cease to speak

I am not certain [sure].

I'm not saying anything.

to be unable to speak

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

I could not speak

of a person, to become totally uncommunicative

having an aspect of not saying anything concretely

There is no saying what may happen.

Can't say anything

（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

I cannot say what I want to say.

the state of being impossible to fully express in words

a word or words the utterance of which is forbidden

I can't say for certain.

I have nothing left to say except 〜.

I can't say anything.

It is beyond recall―past recall.

I cannot say the things that I want to say.

I can't tell.

a discreet condition

There! didn't I say so?

It's no use talking [to talk].＝It's of no use to talk.

I could not speak from fear.

I don't know what to say.

I told you so!

Stop being unreasonable.

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

I have done nothing I dare not own.