あんなことをするなんて、私は愚か者だったに違いない。の英語

I'd have to be an idiot to do that.

Doing that was stupid.

What I stupid thing I did.

How stupid of me to do so!

He thought how foolish he had been.

You've got to be crazy to do something like that.

I was fool enough to do so.

I was fool enough to do so.

It would be foolish, not to say mad, to do such a thing.

How foolish!

I know better than to be believe such a rumor.

I count it folly to do so.

I had a slight scruple about doing that kind of thing.

It would be ill-advised to take such a step.

It was silly of you to make such a mistake.

It is the height of folly to do such a thing.

Never did I see such a fool.

What a fool I was to do such a thing!

You must be a fool to do such a thing.

They say such things out of envy.

Whatever he may say, you musk take no notice of it.

It is the height of folly―folly itself―to do such a thing.

A man of sense would be ashamed of such behavior.

How silly of me!

It is wicked of you to do such things.

I object to being ordered about by such a fellow.

Were I you, I would not do such a rude thing.

If I were you, I wouldn't do such a rude thing.

You are a fool for doing something like that.

What a blunder he has committed!