No way , Jos’e .(informal)
No can do.(informal)
No , sir.
No sirree . (folksy)
No sirree, Bob. (folksy)
You’re out of luck.
In a pig’s eye. (idiomatic)
When pigs fly. (idiomatic)
When hell freezes over. (informal)
There isn’t a snowball’s chance in hell.(informal)
Not a chance.
Not if I can help it.
Not bloody likely.(mildly vulgar)
Only in your dreams (or in your dreams)
Save your breath.
You’re barking up the wrong tree. (idiomatic)
Over my dead body. (idiomatic)
If you think that, you’ve got another think coming.
Not in a million years.
Not for a million dollars.
You couldn’t pay me to do it.
Not in your wildest dreams.
I’ll be damned first. (mildly vulgar)
I’ll be damned if I do. (mildly vulgar)
Damned if I will. (mildly vulgar)
Like hell.(mildly vulgar)
I’ll see you in hell first. (mildly vulgar)
It will be a cold day in hell before I do that. (informal)