あきれてものも言えないよ。の英語

I'm speechless.

I can not speak for astonishment―（他動詞構文にすれば）―Astonishment deprives me of my power of speech.

I cannot completely say that.

I am dumfounded―dumb with astonishment―It is enough to make a cat speak.

I can't even say goodbye.

I was struck dumb with astonishment

Astonishment deprived me of my power of speech.

My lips are sealed.

I cannot say no.

I cannot say goodbye.

Don't tell me.

We can never be completely satisfied.

I can't flatter people.

I am struck dumb with astonishment―I am dumfounded―（他動詞構文にすれば）―Astonishment deprives me of my power of speech.

It doesn't do to complain.

Complaining won't change anything.

Complaining won't change anything.

I am appalled by that.

I am speechless about that.

We cannot hastily conclude that that is the case.

I could not speak for very fear―（他動詞構文にすれば）―Fear deprived me of my power of speech.

It may safely be said that…

of speech, uncalled for

No matter how earnestly you beg me, I cannot agree.

I can't say that I'm sad.

I can't say I'm lonely.

I can also say that.

It would be safe to say―I should be safe in saying―that...

It is no use trying to excuse yourself.

I can not say for certain.