そのうわさにはなんの根拠もない。の英語

The rumor has no foundation.

That's absolute nonsense.

Don't say such pathetic things!

There is no clear reason in that.

Stop your nonsense.

He is not such a fool that he doesn't know it.

He is not such a fool but he knows it.

These is no cause for complaint.

There is no cause for complaint.

for no particular reason

That goes without saying.

Don't talk like that.

You don't mean it, now.

It is beneath him to say such a thing.

Don't say it like that.

I didn't say that.

I have no particular reason.

There's no rhyme or reason to his demands.

Don't be so mean.

I didn't understand what it meant.

That's the stupidest thing I've ever said.

I've never said such a stupid thing.

Such conduct is unjustifiable―inexcusable―Such conduct admits of no excuse―permits of no excuse―allows of no excuse.

That is a completely illogical tale.

I can't tell him that.

I can't tell you.

It is a profanity―a blasphemy―to say such a thing.

I won't complain about that.

The story can't be true.

Nobody would believe poppycock like that.