"nasty consequences" is a correct and usable phrase in written English.
You could use it to refer to something that has undesirable, unpleasant, or adverse effects. For example, "I didn't think about the nasty consequences of my actions until it was too late."
In countries like China that could bring nasty consequences.
But trying to exterminate bacteria has had nasty consequences.
Meanwhile, the return of budget deficits has real, nasty consequences.
"It's tragic, and it will have nasty consequences, but it was inevitable once it started".
Just as naysayers warned six months ago, the force of the clampdown has provoked its own nasty consequences.
Too often in the past a bit of inflation has turned into a lot with nasty consequences.
That, of course, covers just about every page on the Net.This has a nasty consequence.
Yet Brian's dip into the homoerotic playbook has a nasty consequence that feels uncomfortably planned to pander to gay audiences: he may be an arrogant piece of work, but the movie's disturbing final shot suggests something much uglier.
It sounds like a good idea at first, but it comes with one nasty consequence: those viral and sometimes incredibly annoying quiz applications are going to become more popular than ever.
Although a house-price crash would have much nastier consequences for China's economy than a share-price crash, because 80% of China's urban households now own their home, there is no evidence of a nationwide housing bubble.
Asia's economic problems could have much nastier consequences if politicians in rich economies respond badly to Asia's narrowing current-account deficits over the next year as countries reduce imports and increase exports.As these deficits shrink, America's external deficit will certainly widen.
