それを思い悩んだって無駄だよ。の英語

It is no use worrying about it.

Don't even think about it.

That won't make any difference.

Gee, I wish I had that problem.

That won't do

That will never do

That cock won't fight.

You must not do such a thing.

I am repulsed just by thinking about it.

It is no good talking about it.

It's no good talking about it.

Put away such a foolish idea.

You can not do it （in） that way.

I consider the matter of no consequence.

I shudder to think of it.

That is quite impossible―no go.

Don't let your imagination run wild.

It's unkind of you to do such a thing.

Let's not think like that.

I can not entertain the thought

The thought is not to be entertained.

I can not think of such a thing

Don't be so hard on yourself.

Do you think you can be excused for doing such a thing?

Can you excuse yourself for doing such a thing?

Can you justify yourself for doing such a thing?

Don't worry about such a trifle.

I shudder at the bare thought (of it).

It simply doesn't bear thinking about.

You can not do it （in） that way.