これはただ頭で想像して出て来たものでしかない。の英語

It's just imaginary.

Such things exist only in fancy.

I never imagined this would happen.

You must not think of doing such a thing―Such a step is not to be thought of―out of the question.

This is merely my private opinion.

It simply doesn't bear thinking about.

This doesn't make me feel like trying it even a little.

It is nothing more than that I thought about it in this way.

I have never seen this kind of thing before.

It is so dreadful that I don't want to think of it.

I've neither seen nor heard of such a thing.

I have neither seen nor heard of such a thing.

A mere impromptu idea won't do. I want a properly‐thought‐out plan.

I had hardly imagined such a thing could happen so close to home.

Never did I dream of such a thing.

Don't worry about it. It's over.

You should not have done that

You ought not to have done that.

I shudder at bare idea.

I didn't think it would progress in this way.

We didn't expect it to take this long.

I didn't expect it to cost so much.

I didn't think it would take this long.

I don't want to be reminded of it.

a mere conjecture

I cannot think of only myself.

I never thought it would happen.

I little dreamed―little thought―little knew―that things should come to this.

I didn't have time to think about it.

I have never wanted to do this.